Modular viscous fan clutch system

ABSTRACT

A viscous clutch head may be replaced by selecting a viscous clutch head and a mount adapter. The viscous clutch head and the mount adapter may be selected from a group of universal modular fan drives and from a group of mount adapters. The mount adapter of a threaded type or a flange and bolt type may be selected. Depending on the viscous clutch head to be replaced, a fan adapter and/or a pilot adapter may also be selected from a group of fan adapters and from a group of pilot adapters. Accordingly, a range of models of viscous fan clutch systems may be replaced by using a limited number of parts. These parts may be stored on a tool cart. As different models of viscous fan clutch systems may be replaced using a limited number of parts, the in-stock inventory of replacement parts may be reduced.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.14/268,499 filed May 2, 2014, which is a continuation of U.S.application Ser. No. 13/843,703 filed Mar. 15, 2013, which claimspriority to U.S. Application No. 61/752,067 filed Jan. 14, 2013, andU.S. Application No. 61/754,728 filed Jan. 21, 2013, the entire contentsof each of which are incorporated in the present document by reference.

BACKGROUND

A conventional viscous fan clutch system consists of a clutch acting asan input member and a fan acting as an output member. Both clutch andfan are on a shaft assembly which drives the input member, in turnpowering the output member. As the driving member, the clutch transferstorque to the fan through shearing of a viscous fluid, thus driving thefan. A pumping mechanism and temperature sensor regulate the amount offluid in the cavity between clutch and fan, thus setting the amount oftorque transmitted to the fan through shearing.

Clutches can have different design parameters based on the application.The fan can provide cooling when the engine temperature rises about athreshold temperature. In this case, the clutch and fan are fullyengaged to transfer more torque and drive more air in order to cool theengine to the desired temperature. When the engine temperature is belowa threshold temperature, the fan clutch can partially disengage,avoiding unnecessary power expenditures from the engine. Instead of athreshold temperature, factors such as delayed or advanced engagementtime, valve size or rpm may be used to set clutch and fan engagement.

When a viscous clutch fan assembly fails, parts may be replaced with acompatible repair part. Given the wide range of applications for viscousfan clutches, there are numerous models and makes, each with their ownintegral mounting systems. In the heavy duty viscous clutch market,manufacturers and dealers may have to build and stock several thousandsof different parts to provide replacements for each model of viscous fanclutches, as each model of viscous fan clutch requires model-specificreplacement parts.

SUMMARY

A viscous clutch head may be replaced by selecting a viscous clutch headand a mount adapter. In an illustrative embodiment, the viscous clutchhead and the mount adapter may be selected from a group of universalmodular fan drives and from a group of mount adapters. In theillustrative embodiment, the mount adapter of a threaded type or aflange and bolt type may be selected. Depending on the viscous clutchhead to be replaced, a fan adapter and/or a pilot adapter may also beselected from a group of fan adapters and from a group of pilot adaptersin another illustrative embodiment.

Accordingly, in the illustrative embodiments, a range of models ofviscous fan clutch systems may be replaced by using a limited number ofparts. These parts may be stored on a tool cart. As different models ofviscous fan clutch systems may be replaced using a limited number ofparts, the in-stock inventory of replacement parts may be reduced.

In an exemplary embodiment, the mount adapter may have two ends, with acircular bore and a square bore on one end, a male thread on the otherend, and through holes located around the circumference.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics and advantages of an exemplary embodiment are setout in more detail in the following description, made with reference tothe accompanying drawings.

FIG. 1 depicts a schematic view of an exemplary embodiment;

FIGS. 2A-2C depict respectively a schematic front, isometric, andcross-sectional view of a fan adapter;

FIGS. 3A-C depict respectively a schematic front, isometric, andcross-sectional view of a fan spacer;

FIGS. 4A-D depict respectively a schematic front, side, isometric, andcross-sectional view of a threaded type mount adapter;

FIGS. 5A-D depict respectively a schematic front, side, isometric, andcross-sectional view of a flange and bolt type mount adapter;

FIGS. 6A-B depict respectively a schematic front and cross-sectionalview of a pilot adapter;

FIGS. 7A-B depict respectively a schematic isometric and side view of athread gauge;

FIG. 8 depicts a tool cart for storing and accessing elements from anexemplary embodiment;

FIG. 9 depicts a flow chart used in an exemplary embodiment forassembling a universal modular fan drive (UMFD) with adapters;

FIG. 10 depicts a schematic cross-sectional view of a viscous clutchhead;

FIG. 11 depicts a flow chart for measuring an existing viscous clutchhead in order to identify the required UMFD and associated adapters forreplacement;

FIGS. 12A-C depict respectively a schematic isometric, front, andcross-sectional view of a fan adapter;

FIG. 13 depicts a fan adapter with dowels;

FIGS. 14A-C depicts a first fan spacer;

FIGS. 15A-C depict respectively a schematic isometric, front, andcross-sectional view of a second fan spacer;

FIGS. 16A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a first threaded mount adapter;

FIGS. 17A-D depict respectively a schematic isometric, front, side, andcross-sectional, view of a second threaded mount adapter;

FIGS. 18A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a third threaded mount adapter;

FIGS. 19A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fourth threaded mount adapter;

FIGS. 20A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fifth threaded mount adapter;

FIGS. 21A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a sixth threaded mount adapter;

FIGS. 22A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a seventh threaded mount adapter;

FIGS. 23A-D depict respectively a schematic isometric, front, side, andcross-sectional view of an eighth threaded mount adapter;

FIGS. 24A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a ninth threaded mount adapter;

FIGS. 25A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a tenth threaded mount adapter;

FIGS. 26A-D depict respectively a schematic isometric, front, side, andcross-sectional view of an eleventh threaded mount adapter;

FIG. 27A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twelfth threaded mount adapter;

FIG. 28A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a thirteenth threaded mount adapter;

FIG. 29A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fourteenth threaded mount adapter;

FIG. 30A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fifteenth threaded mount adapter;

FIG. 31A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a sixteenth threaded mount adapter;

FIGS. 32A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a seventeenth threaded mount adapter;

FIGS. 33A-D depict respectively a schematic isometric, front, side, andcross-sectional view of an eighteenth threaded mount adapter;

FIGS. 34A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a nineteenth threaded mount adapter;

FIGS. 35A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twentieth threaded mount adapter;

FIGS. 36A-E depict respectively a schematic isometric, front, side,cross-sectional, and detail view of a twenty-first threaded mountadapter;

FIGS. 37A-E depict respectively a schematic isometric, front, side,cross-sectional, and detail view of a twenty-second threaded mountadapter;

FIGS. 38A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twenty-third threaded mount adapter;

FIGS. 39A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a first flange and bolt mount adapter;

FIGS. 40A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a second flange and bolt mount adapter;

FIGS. 41A-E depict respectively a schematic isometric, front, side,cross-sectional and detail view of a third flange and bolt mountadapter;

FIGS. 42A-F depict respectively a schematic isometric, front, side,cross-sectional back and detail view of a fourth flange and bolt mountadapter;

FIGS. 43A-F depict respectively a schematic isometric front sidecross-sectional rear and detail view of a fifth flange and bolt mountadapter;

FIGS. 44A-F depict respectively a schematic isometric, front, side,cross-sectional, rear, and detail view of a sixth flange and bolt mountadapter;

FIGS. 45A-F depict respectively a schematic isometric, front, side,cross-sectional rear and detail view of a seventh flange and bolt mountadapter;

FIGS. 46A-D depict respectively a schematic isometric, front, side, andcross-sectional view of an eighth flange and bolt mount adapter;

FIGS. 47A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a ninth flange and bolt mount adapter;

FIGS. 48A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a tenth flange and bolt mount adapter;

FIGS. 49A-E depict respectively a schematic isometric, front, side,cross-sectional, and detail view of an eleventh flange and bolt mountadapter;

FIGS. 50A-E depict respectively a schematic isometric, front, side,cross-sectional, and detail view of a twelfth flange and bolt mountadapter;

FIGS. 51A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a thirteenth flange and bolt mount adapter;

FIGS. 52A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fourteenth flange and bolt mount adapter;

FIGS. 53A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a fifteenth flange and bolt mount adapter;

FIGS. 54A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a sixteenth flange and bolt mount adapter;

FIGS. 55A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a seventeenth flange and bolt mount adapter;

FIGS. 56A-F depict respectively a schematic isometric, front, side,cross-sectional, rear, and detail view of an eighteenth flange and boltmount adapter;

FIGS. 57A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a nineteenth flange and bolt mount adapter;

FIGS. 58A-F depict respectively a schematic isometric, front, side,back, detail, and cross-sectional view of a twentieth flange and boltmount adapter;

FIGS. 59A-E depict respectively a schematic isometric, front, rear,side, and cross-sectional view of a twenty-first flange and bolt mountadapter;

FIGS. 60A-E depict respectively a schematic isometric, front, side, rearand cross-sectional view of a twenty-second flange and bolt mountadapter;

FIGS. 61A-F depict respectively a schematic isometric, front, side,rear, detail, and cross-sectional view of a twenty-third flange and boltmount adapter;

FIGS. 62A-E depict respectively a schematic isometric, front, side,rear, and cross-sectional view of a twenty-fourth flange and bolt mountadapter;

FIGS. 63A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twenty-fifth flange and bolt mount adapter;

FIGS. 64A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twenty-sixth flange and bolt mount adapter;

FIGS. 65A-D depict respectively a schematic isometric, front, side, andcross-sectional view of a twenty-seventh flange and bolt mount adapter;

FIGS. 66A-E depict respectively a schematic isometric, front, side,rear, and cross-sectional view of a twenty-eighth flange and bolt mountadapter;

FIGS. 67A-B depict respectively a schematic front and cross-sectionalview of a first pilot adapter;

FIGS. 68A-B depict respectively a schematic front and cross-sectionalview of a second pilot adapter;

FIGS. 69A-B depict respectively a schematic front and cross-sectionalview of a third pilot adapter;

FIGS. 70A-B depict respectively a schematic front and cross-sectionalview of a fourth pilot adapter;

FIGS. 71A-B depict respectively a schematic front and cross-sectionalview of a fifth pilot adapter;

FIGS. 72A-B depict respectively a schematic front and cross-sectionalview of a sixth pilot adapter;

FIGS. 73A-B depict respectively a schematic front and cross-sectionalview of a seventh pilot adapter;

FIGS. 74A-B depict respectively a schematic front and cross-sectionalview of a eighth pilot adapter;

FIGS. 75A-B depict respectively a schematic front and cross-sectionalview of a ninth pilot adapter;

FIGS. 76A-B depict respectively a schematic front and cross-sectionalview of a tenth pilot adapter;

FIGS. 77A-B depict respectively a schematic front and cross-sectionalview of a eleventh pilot adapter;

FIGS. 78A-B depict respectively a schematic front and cross-sectionalview of a twelfth pilot adapter;

FIGS. 79A-B depict respectively a schematic front and cross-sectionalview of a thirteenth pilot adapter;

FIGS. 80A-B depict respectively a schematic front and cross-sectionalview of a fourteenth pilot adapter;

FIGS. 81A-B depict respectively a schematic front and cross-sectionalview of a fifteenth pilot adapter;

FIGS. 82A-B depict respectively a schematic front and cross-sectionalview of a sixteenth pilot adapter;

FIGS. 83A-B depict respectively a schematic isometric andcross-sectional view of a first thread gauge;

FIGS. 84A-B depict respectively a schematic isometric andcross-sectional view of a second thread gauge;

FIGS. 85A-C depict respectively a schematic isometric, front, andcross-sectional view of a third thread gauge;

FIGS. 86A-C depict respectively a schematic isometric, front, andcross-sectional view of a spanner wrench;

FIGS. 87A-B depict respectively a schematic front and side view of atool cradle;

FIGS. 88A-D depict respectively a schematic unfolded, side, front, andisometric view of a drill template;

FIGS. 89A-B depict respectively a schematic front and side view of awrenching plate;

FIGS. 90A-B depict respectively a schematic front and side view of astiffener plate; and

FIGS. 91A-C depict respectively a schematic top, front, and side view ofa tool cradle assembly.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

Objects, advantages, and features of the exemplary modular viscous fanclutch system described herein will be apparent to one skilled in theart from a consideration of this specification, including the attacheddrawings.

Universal modular fan drives (UMFD) may replace multiple viscous clutchhead designs currently in service. There may be two UMFDs of differentsizes; for example: a large UMFD which may have a maximum outer diameterbetween approximately 200 mm to approximately 300 mm, and a small UMFDwhich may have a maximum outer diameter of approximately 100 mm toapproximately 200 mm. There may be four different designs for each UMFD,with two designs differing based on viscosity and two designs differingon volume of fluid to be used. Therefore, each UMFD may have fourdifferent designs to cover the use of two different ranges of fluidviscosity and two different ranges of fluid volume. In other words,there may be eight different UMFDs.

An exemplary embodiment may use UMFDs, and may provide a limited numberof adapters to connect one of the UMFDs with a fan (not shown), therebyallowing a viscous clutch system to be replaced.

In an exemplary embodiment of the present invention, the UMFD may bedistinct from a mounting system. An exemplary embodiment providesadapters to mate one of the UMFDs with both a fan blade hub (not shown)on one end, and an engine block mount (not shown) on the other end,using a combination of an optional fan adapter or spacer, a mountadapter, and an optional pilot adapter.

In an exemplary embodiment, a method of selecting one of a plurality ofUMFDs may be used, where each UMFD may be universal in the sense that itmay be adapted to replace a plurality of individual viscous clutchdesigns. The method may comprise selecting one of a plurality ofuniversal mount adapters which are configured to connect the UMFDs to anapplicable fan blade hub, optionally selecting one or more fan adaptersdesigned to adapt the pilot and bolt pattern of the selected UMFD to anapplicable fan blade hub, and optionally selecting a pilot adapter whichhelps align the mount adapter to a post or other mounting position onthe engine.

Referring to FIG. 1, an exemplary embodiment may use a UMFD 1, and amount adapter 3, which may be a threaded type 3 a or a flange and bolttype 3 b. The adapter 3 includes a threaded end 31 which is threadedinto a receiving nut 11 of the UMFD 1. Optionally, a fan adapter orspacer 2 and a pilot adapter 4 may be used.

An exemplary embodiment may use a flange and bolt type mount adapter 3 bin combination with a pilot adapter 4 to fit the part diameter and toensure the clutch may be mounted on center and balanced. In anotherembodiment of the present invention, a threaded type mount adapter 3 amay be used instead.

In an exemplary embodiment a viscous clutch system may be repaired orreplaced using only one of the UMFDs, and one of fifty-one mountadapters. In addition, one of sixteen pilot adapters and one of threefan pilot adapters or spacers may be used. In an exemplary embodiment ofthe present invention, the UMFDs in combination with the adaptercombination described above allow replacements for a majority ofexisting clutch heads.

The number and type of models for mount adapters, pilot adapters, andfan adapters or spacers may be based on sizing and dimensionalspecifications, such that the combination of adapters covers a widerange of fan clutch systems. In one embodiment, a number of parts forreplacing the wide range of fan clutch systems may be reduced.

FIGS. 2A-2C show a generic fan adapter and associated parameters. FIGS.3A-3C show a generic fan spacer and associated parameters. FIGS. 4A-4Dshow a generic threaded type mount adapter and FIGS. 5A-5D show ageneric flange and bolt type mount adapter. FIGS. 6A-6B show a genericpilot adapter.

To assemble a replacement viscous fan clutch system, an exemplaryembodiment indicates an assembly procedure with steps described in FIG.9. Step 201 inserts a UMFD 1 into a holding cradle HC. The holdingcradle HC may be located on top of a tool cart. Step 202 positions anyoptionally required fan adapters or spacers 2, which may be required forsome viscous fan clutch systems. Step 203 threads the threaded end 31 ofa selected mount adapter 3 into the receiving nut 11 of the UMFD 1. Thissecures the optionally required fan adapter or spacer 2 in place. Step204 selects an appropriate wrench type using a chart which may beprovided. Step 205 uses the appropriate wrench selected in Step 204 totorque the selected mount adapter 3 to the UMFD 1. If needed, step 206installs a fan pilot adapter 4 immediately prior to step 207, which ismounting the clutch system on the vehicle.

Referring to FIG. 10, an exemplary embodiment indicates a process ofselecting the appropriate UMFD and adapter combination by measuring theviscous clutch head I to be replaced. As shown in FIG. 10, keydimensions to be measured on the viscous clutch head I to be replacedare a length II, the drive pilot diameter III, drive bolt circlediameter IV, fan pilot diameter V, and fan bolt circle diameter VI. Thelength II measured in step 106 may correspond to the distance betweenthe clutch head base and the clutch head drive component, as shown inFIG. 10. To replace a defective viscous clutch head and install anassociated mounting system, an exemplary embodiment proposes severalsteps for identifying a set of compatible components.

Referring to FIG. 11, step 101 measures fan size. Step 102 determineswhether the rotation direction of the fan is clockwise or counterclockwise. Step 103 is an assessment of the bracket type as bolt-on orscrew-on, determining whether the customer moves to step 104 (using aflange and bolt type mount adapter) or step 106 (using a threaded typemount adapter). Steps 104-108 are measurements of the drive bolt circlediameter IV, the drive pilot diameter III, the length II, the fan pilotdiameter V and the fan bolt circle diameter VI, respectively. Thesemeasurements are shown in FIG. 10. Step 109 identifies the thread typeusing thread gauges. Non-limiting examples of the thread gauges areshown in FIGS. 83A-83B, 84A-84B, and 85A-85C. Step 110 selects necessarycomponents based on the measurements taken.

Through holes are defined as holes which begin on one end of the workpiece, and ends on the other end of the work piece, traversing it in itsentirety. In contrast, a hole may begin at one end of the work piece,but be machined only to a certain depth which is less than the workpiece thickness. Similarly a hole may be bored into a piece, but thehole only threaded along part of its length. All figures are shown toscale.

When connecting a UMFD with a fan, an adjustment may be required betweenthe diameter of the fan and the diameter of the UMFD. In this case, afan adapter may be required. In an exemplary embodiment, a fan adaptermay be designed to adapt the pilot and bolt pattern of the selected UMFDto a fan blade hub. Referring to FIG. 2A-2C, a fan adapter FA may be anannulus shaped component with an outermost diameter D3 a and aninnermost diameter D0 a. Each fan adapter may have a male lip withdiameter D4 a, and a female lip with the innermost diameter D0 a, wherethe lips may be on either side of a section with thickness t1 a. At thetransition between the male lip and the main section of the fan adapter,a radius between 0.01″ and 0.02″ may be allowed. The total fan adapterthickness may be t2 a. Two types of holes may be evenly positionedaround the circumference of the fan spacer, the first set of holeslocated at a diameter D1 a, and spaced with an angle θ1 a between eachhole and its neighboring holes. The second set of holes may be locatedat a diameter D2 a, spaced with an angle θ2 a between each hole and itsneighboring holes. The part number may be engraved at a diameter greaterthan D1 a.

Referring to FIGS. 12A-12C, an exemplary embodiment may comprise a fanadapter FA-1 which may adapt a fan with a larger pilot diameter to fiton a UMFD with a smaller pilot diameter. The fan adapter may be made outof 1045 Steel, and may be provided with a black oxide finish. The fanadapter outermost diameter D3 a-1 may be between 1 and 1.6 of thediameter D4 a-1, more preferably between 1.1 and 1.5 of the diameter D4a-1, still more preferably between 1.3 and 1.4 of the diameter D4 a-1.The fan adapter diameter D0 a-1 may be between 0.3 and 0.8 of thediameter D3 a-1, more preferably between 0.4 and 0.7 of the diameter D3a-1, still more preferably between 0.5 and 0.6 of the diameter D3 a-1.The fan adapter may comprise a series of six evenly spaced through holesH1-F1-1 at a diameter D1 a-1, and a second outermost series of sixthrough holes H2-F1-1 aligned radially with the first series of holesH1-F1-1 but at a diameter D2 a-1. The outermost series of holes H2-F1-1may have a smaller diameter, while the inner most series of holesH1-F1-1 may have a larger diameter. The outermost series of holesH2-F1-1 may be machined with a chamfer feature. A first width t1 a-1 maybe between 0.6 and 0.7 the total width of the adapter t2 a-1. Six dowelpins may be inserted in the outermost holes at diameter D2 a-1 while theinner circle of holes H1-F1-1 located at D1 a-1 on the fan adapter mayreceive protrusions located on the UMFD.

Referring to FIG. 13, an exemplary embodiment of a fan adapter FA-2 isshown with dowel pins. The dowel pins may be inserted into holes on thefan during the assembly process.

In addition to an adjustment in pilot diameter when connecting a UMFDwith a fan, a specific spacing between the fan and the clutch headradiator may need to be achieved. To obtain the necessary spacing whenconnecting the UMFD with the fan, a fan spacer may be used to achievethe required spacing.

In an exemplary embodiment, fan spacers may be machined out of 1018steel, with a black oxide finish. All sharp edges may be broken and allburrs removed. Referring to FIG. 3A-3C, a fan spacer FS may be anannulus shaped component with an outermost diameter D3 which may bebetween 1.2 and 1.7 of an innermost diameter D0, more preferably between1.3 and 1.6 of an innermost diameter D0, still more preferably between1.4 and 1.5 of an innermost diameter D0. Each fan spacer may have afemale lip with diameter D4, and a male lip with diameter D0, where thelips may be on either side of a section which determines the fan spacingamount with thickness t1. At the transition between the male lip and themain section of the fan spacer, a maximum radius may be allowed. Thetotal fan spacer thickness may be t2. Two types of holes may be evenlypositioned around the circumference of the fan spacer, the first set ofholes H1 located at a diameter D1, and spaced with an angle θ1 betweeneach hole and its neighboring holes. The second set of holes H2 may belocated at a diameter D2, spaced with an angle θ2 between each hole andits neighboring holes. For each exemplary embodiment, referencecharacters may be further distinguished by a numeric suffix, i.e., D0-1for diameter D0 in a first embodiment of a fan spacer.

Referring to FIGS. 14A-14C, an exemplary embodiment of a first fanspacer FS-1 may comprise a female lip with a diameter D4-1 may bebetween 0.8 and 1.6 of a male lip diameter D0-1, more preferably between0.9 and 1.5 of a male lip diameter D0-1, still more preferably between 1and 1.2 of the male lip diameter D0-1, with a maximum thickness tomaximum diameter ratio between 0.05 and 0.15, more preferably between0.06 and 0.1, and still more preferably between 0.07 and 0.09. The fanspacing amount may be determined by thickness t1-1 which may be between0.5 and 1 of the total fan space thickness t2-1, more preferably between0.6 and 0.9 of the total fan space thickness t2-1, still more preferablybetween 0.7 and 0.8 of the total fan spacer thickness t2-1. The male lipmay protrude by t2-1 minus t1-1. The first set of holes H1-S1 may belocated at a diameter D1-1, which may be the same as the diameter D2-1of the second set of holes H2-S1, spaced with an angle θ1-1, identicalto the angle θ2-1. Six of the holes H1-S1 may have a diameter goingthrough the part, with a wider diameter circular hole with a depth. Thesix remaining holes H2-S1 may be threaded. A part number may be engravedat a diameter greater than D1-1.

Referring to FIGS. 15A-15C, an exemplary embodiment of a second fanspacer FS-2 may comprise a female lip with a diameter D4-2 between 0.8and 1.4 of the male lip diameter D0-2, more preferably between 0.9 and1.3 of the diameter D0-2, still more preferably between 1 and 1.2 of thediameter D0-2, while the fan spacing amount may be determined bythickness t1-2, with a maximum thickness to maximum diameter ratiobetween 0.01 and 0.09, more preferably between 0.02 and 0.08, and stillmore preferably between 0.04 and 0.06. The male lip may protrude by t2-2minus t1-2. The second fan spacer FS-2 may comprise a single series ofsix holes H1-S2 spaced evenly around its circumference, all located at asame diameter D1-2. Holes may have a diameter going through the part. Apart number may be engraved at a diameter greater than D1-2.

Mount adapters serve to connect a selected UMFD to a variety of engineblock mounts. Engine block mounts may be of two types determined by theengine block attachment mode: flange and bolt type or threaded type. Twomount adapter types correspond to these engine block attachment modes.There may be threaded adapters for both the large and small UMFD models,and there may be flange and bolt type adapters for both the large andsmall UMFD models. The mount adapters may be manufactured out of 1215steel, and may be may be provided with a black oxide finish.

Referring to FIGS. 4A-4D, a threaded type mount adapter TMA may have anoverall cylindrical shape with a hexagonal section. The adapter may haveoverall length L1, with four longitudinal sections, the first sectionmay have length a and diameter Da, the second section may have ahexagonal profile with length b and diameter Db, the third section mayhave length c and diameter Dc, and the fourth section may have length dand end diameter Dd. The threaded mount adapter may be characterized bya characteristic length LC1, which is the combined length of the firstthrough third sections. The second section may be further referenced bythe width of its hexagonal section HL. The transition between the thirdand fourth sections may use a bevel with a width between 0.1″ and 0.15″,followed by a slope measured from the longitudinal direction which leadsto the fourth section diameter. The end of the mount adapter opposed tothe fourth section may be bored out to a maximum depth Dm, and threadedto a depth Dt. An optional center drill hole CDH may be present in thefourth section. In an exemplary embodiment of the present invention, thepart number may be written on a face of the second section. For eachexemplary embodiment, reference characters may be further distinguishedby a numeric suffix, i.e., L1-1 for length L1 in a first embodiment of athreaded type mount adapter.

Referring to FIGS. 16A-16D, a first threaded mount adapter TMA-1 mayhave characteristic length LC1-1, which is the combined length of thefirst section through the third section, with LC1-1 between 0.7 and 0.95more preferably between 0.75 and 0.9, still more preferably between 0.8and 0.85 of the total adapter length L1-1, with a maximum diameter tocharacteristic length ratio between 0.65 and 0.95, more preferablybetween 0.7 and 0.9, and still more preferably between 0.75 and 0.85.The threaded mount adapter TMA-1 may be used in combination with thelarge UMFD. The first section may have a length a-1 and diameter Da-1,the second section with a length b-1 and a diameter Db-1, the thirdsection with a length c-1 and a diameter Dc-1 equal to Da-1, and thefourth section with a length d-1 with an end diameter Dd-1 between 0.1and 0.4, more preferably between 0.2 and 0.3, still more preferablybetween 0.22 and 0.27 of L1-1. HL-1 may be between 0.5 and 0.625 ofL1-1. Dt-1 may be threaded with a female thread. The fourth section maybe threaded with a male thread and end chamfers. The center drill holeCDH-1 may have a maximum diameter and a maximum depth. The depth Dm-1 ofthe bore may be followed by a conical countersink.

Referring to FIGS. 17A-17D, a second threaded mount adapter TMA-2 mayhave characteristic length LC1-2, which is the combined length of thefirst through third sections with LC1-2 between 0.5 and 0.8, morepreferably between 0.6 and 0.7, still more preferably between 0.65 and0.75 of the total adapter length L1-2, with a maximum diameter tocharacteristic length ratio between 1.6 and 1.9, more preferably between1.65 and 1.85, and still more preferably between 1.7 and 1.8. Thethreaded mount adapter TMA-2 may be used in combination with the largeUMFDs. The first section may have a length a-2 and diameter Da-2, thesecond section with a length b-2 and a diameter Db-2, the third sectionwith a length c-2 and a diameter Dc-2 equal to Da-2, and the fourthsection with a length d-2 and an end diameter Dd-2. HL-2 may be between0.6 and 1.35, more preferably between 0.7 and 1.25, still morepreferably between 0.8 and 1.15 of L1-2. Dt-2 may be threaded with afemale thread. The fourth section may be threaded with a male thread,and end chamfers. The center drill hole CDH-2 may have a maximumdiameter and a maximum depth. The depth Dt-2 of the female threadedportion may be followed by a cylindrical countersink, with cornersrounded to a maximum radius.

Referring to FIGS. 18A-18D, a third threaded mount adapter TMA-3 mayhave characteristic length LC1-3, which is the combined length of thefirst through third sections, between 0.65 and 1, more preferablybetween 0.7 and 0.95, still more preferably between 0.74 and 0.92 of thetotal length L1-3, with a maximum diameter to characteristic lengthratio between 0.85 and 1.15, more preferably between 0.9 and 1.1, andstill more preferably between 0.95 and 0.99. The threaded mount adapterTMA-3 may be used in combination with the large UMFDs. The first sectionmay have a length a-3 and diameter Da-3, the second section with alength b-3 and a diameter Db-3, the third section with a length c-3 anda diameter Dc-3 equal to Da-3, and the fourth section with a length d-3and an end diameter Dd-3. HL-3 may be between 0.4 and 0.91, morepreferably between 0.5 and 0.81, still more preferably between 0.6 and0.71 of L1-3. Dt-3 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-3 may have a maximum diameter and a maximum depth. Thedepth Dm-3 of the bore may be followed by a conical countersink.

Referring to FIGS. 19A-19D, a fourth threaded mount adapter TMA-4 mayhave characteristic length LC1-4, which is the combined length of thefirst through third sections, between 0.4 and 0.8, more preferablybetween 0.5 and 0.75, still more preferably between 0.55 and 0.71 of thetotal length L1-4, with a maximum diameter to characteristic lengthratio between 1.75 and 2.05, more preferably between 1.8 and 2, andstill more preferably between 1.85 and 1.95. The threaded mount adapterTMA-4 may be used in combination with the large UMFDs. The first sectionmay have a length a-4 and diameter Da-4, the second section with alength b-4 and a diameter Db-4, the third section with a length c-4 anda diameter Dc-4 equal to Da-4, and the fourth section with a length d-4and an end diameter Dd-4. HL-4 may be between 0.75 and 1.55, morepreferably between 0.8 and 1.5, still more preferably between 0.83 and1.2 of L1-4. Dt-4 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-4 may have a maximum diameter to a maximum depth. Thedepth Dt-4 of the female threaded portion may be followed by acylindrical countersink, with corners rounded to a maximum radius.

Referring to FIGS. 20A-20D, a fifth threaded mount adapter TMA-5 mayhave characteristic length LC1-5 which is the combined length of thefirst through third sections, between 0.7 and 0.9, more preferablybetween 0.75 and 0.83, still more preferably between 0.78 and 0.8 of thetotal length L1-5, with a maximum diameter to characteristic lengthratio between 1.2 and 1.35, more preferably between 1.22 and 1.3, andstill more preferably between 1.25 and 1.27. The threaded mount adapterTMA-5 may be used in combination with the large UMFDs. The first sectionmay have a length a-5 and diameter Da-5, the second section with alength b-5 and a diameter Db-5, the third section with a length c-5 anda diameter Dc-5 equal to Da-5, and the fourth section with a length d-5and an end diameter Dd-5. HL-5 may be between 0.55 and 1, morepreferably between 0.6 and 0.94, still more preferably between 0.625 and0.93 of L1-5. Dt-5 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-5 may have a maximum diameter to a maximum depth. Thedepth Dm-5 of the bore may be followed by a conical countersink.

Referring to FIGS. 21A-21D, a sixth threaded mount adapter TMA-6 mayhave characteristic length LC1-6 which is the combined length of thefirst through third sections, between 0.5 and 0.78, more preferablybetween 0.55 and 0.73, still more preferably between 0.61 and 0.68 ofthe total length L1-6, with a maximum diameter to characteristic lengthratio between 2.65 and 2.95, more preferably between 2.7 and 2.9, andstill more preferably between 2.75 and 2.85. The threaded mount adapterTMA-6 may be used in combination with the small UMFDs. The first sectionmay have a length a-6 and diameter Da-6, the second section with alength b-6 and a diameter Db-6, the third section with a length c-6 anda diameter Dc-6 equal to Da-6, and the fourth section with a length d-6and an end diameter Dd-6. HL-6 may be between 1 and 1.9, more preferablybetween 1.1 and 1.8, still more preferably between 1.15 and 1.78 ofL1-6. Dm-6 may be threaded with a female thread. The fourth section maybe threaded with a male thread, and end chamfers. The center drill holeCDH-6 may have a maximum diameter to a maximum depth. The depth Dt-6 ofthe female threaded portion may be followed by a cylindricalcountersink, with corners rounded to a maximum radius.

Referring to FIGS. 22A-22D, a seventh threaded mount adapter TMA-7 mayhave characteristic length LC1-7 which is the combined length of thefirst through third sections, between 0.75 and 0.95, more preferablybetween 0.8 and 0.9, still more preferably between 0.83 and 0.86 of thetotal length L1-7, with a maximum diameter to characteristic lengthratio between 0.9 and 1.1, more preferably between 0.92 and 1, and stillmore preferably between 0.95 and 0.97. The threaded mount adapter TMA-7may be used in combination with the small UMFDs. The first section mayhave a length a-7 and diameter Da-7, the second section with a lengthb-7 and a diameter Db-7, the third section with a length c-7 and adiameter Dc-7 equal to Da-7, and the fourth section with a length d-7and an end diameter Dd-7. HL-7 may be between 0.3 and 1, more preferablybetween 0.4 and 0.9, still more preferably between 0.5 and 0.8 of L1-7.Dt-7 may be threaded with a female thread. The fourth section may bethreaded with a male thread and end chamfers. The center drill holeCDH-7 may have a maximum diameter to a maximum depth. The depth Dm-7 ofthe bore may be followed by a conical countersink.

Referring to FIGS. 23A-23D, an eighth threaded mount adapter TMA-8 mayhave characteristic length LC1-8, which is the combined length of thefirst through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.8, still more preferably between 0.73 and 0.76 of thetotal length L1-8, with a maximum diameter to characteristic lengthratio between 1.75 and 2.05, more preferably between 1.8 and 2, andstill more preferably between 1.85 and 1.95. The threaded mount adapterTMA-8 may be used in combination with the small UMFDs. The first sectionmay have a length a-8 and diameter Da-8, the second section with alength b-8 and a diameter Db-8, the third section with a length c-8 anda diameter Dc-8 equal to Da-8, and the fourth section with a length d-8and an end diameter Dd-8. HL-8 may be between 0.8 and 1.4, morepreferably between 0.85 and 1.35, still more preferably between 0.88 and1.32 of the total length L1-8. Dt-8 may be threaded with a femalethread. The fourth section may be threaded with a male thread, and endchamfers. The center drill hole CDH-8 may have a maximum diameter to amaximum depth. The depth Dt-8 of the female threaded portion may befollowed by a cylindrical countersink, with corners rounded to a maximumradius.

Referring to FIGS. 24A-24D, a ninth threaded mount adapter TMA-9 mayhave characteristic length LC1-9, which is the combined length of thefirst through third sections between 0.7 and 0.92, more preferablybetween 0.75 and 0.87, still more preferably between 0.8 and 0.83 of thetotal length L1-9, with a maximum diameter to characteristic lengthratio between 1.15 and 1.45, more preferably between 1.2 and 1.4, andstill more preferably between 1.25 and 1.35. The threaded mount adapterTMA-9 may be used in combination with the small UMFDs. The first sectionmay have a length a-9 and diameter Da-9, the second section with alength b-9 and a diameter Db-9, the third section with a length c-9 anda diameter Dc-9 equal to Da-9, and the fourth section with a length d-9and an end diameter Dd-9. HL-9 may be between 0.55 and 1.15, morepreferably between 0.6 and 1.1, still more preferably between 0.65 and 1of L1-9. Dt-9 may be threaded with a female thread. The fourth sectionmay be threaded with a male thread, and end chamfers. The center drillhole CDH-9 may have a maximum diameter to a maximum depth.

Referring to FIGS. 25A-25D, a tenth threaded mount adapter TMA-10 mayhave characteristic length LC1-10, which is the combined length of thefirst through third sections, between 0.55 and 0.75, more preferablybetween 0.6 and 0.7, still more preferably between 0.64 and 0.67 of thetotal length L1-10, with a maximum diameter to characteristic lengthratio between 2.55 and 2.85, more preferably between 2.6 and 2.8, andstill more preferably between 2.65 and 2.75. The threaded mount adapterTMA-10 may be used in combination with the small UMFDs. The firstsection may have a length a-10 and diameter Da-10, the second sectionwith a length b-10 and a diameter Db-10, the third section with a lengthc-10 and a diameter Dc-10 equal to Da-10, and the fourth section with alength d-10 and an end diameter Dd-10. HL-10 may be between 0.9 and 1.8,more preferably between 1 and 1.7, still more preferably between 1.1 and1.67 of L1-10. Dt-10 may be threaded with a female thread. The fourthsection may be threaded, and end chamfers. The center drill hole CDH-10may have a maximum diameter to a maximum depth. The depth Dt-10 of thefemale threaded portion may be followed by a cylindrical countersink,with corners rounded to a maximum radius.

Referring to FIGS. 26A-26D, an eleventh threaded mount adapter TMA-11may have characteristic length LC1-11, which is the combined length ofthe first through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.85, still more preferably between 0.77 and 0.8 of thetotal length L1-11, with a maximum diameter to characteristic lengthratio between 1.35 and 1.6, more preferably between 1.4 and 1.55, andstill more preferably between 1.45 and 1.5. The threaded mount adapterTMA-11 may be used in combination with the small UMFDs. The firstsection may have a length a-11 and diameter Da-11, the second sectionwith a length b-11 and a diameter Db-11, the third section with a lengthc-11 and a diameter Dc-11 equal to Da-11, and the fourth section with alength d-11 and an end diameter Dd-11. HL-11 may be between 0.65 and1.25, more preferably between 0.7 and 1.2, still more preferably between0.75 and 1.14 of L1-11. Dt-11 may be threaded with a female thread. Thefourth section may be threaded with a male thread, and end chamfers. Thecenter drill hole CDH-11 may have a maximum diameter to a maximum depth.The depth Dm-11 of the bore may be followed by an optional conicalcountersink.

Referring to FIGS. 27A-27D, a twelfth threaded mount adapter TMA-12 mayhave characteristic length LC1-12, which is the combined length of thefirst through third sections, between 0.4 and 0.75, more preferablybetween 0.45 and 0.7, still more preferably between 0.5 and 0.64 of thetotal length L1-12, with a maximum diameter to characteristic lengthratio between 3 and 3.5, more preferably between 3.1 and 3.4, and stillmore preferably between 3.2 and 3.3. The threaded mount adapter TMA-12may be used in combination with the small UMFDs. The first section mayhave a length a-12 and diameter Da-12, the second section with a lengthb-12 and a diameter Db-12, the third section with a length c-12 and adiameter Dc-12 equal to Da-12, and the fourth section with a length d-12and an end diameter Dd-12. HL-12 may be between 1.1 and 1.9, morepreferably between 1.2 and 1.85, still more preferably between 1.25 and1.79 of L1-12. Dt-12 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-12 may have a maximum diameter to a maximum depth. Thedepth Dt-12 of the female threaded portion may be followed by acylindrical countersink, with corners rounded to a maximum radius.

Referring to FIGS. 28A-28D, a thirteenth threaded mount adapter TMA-13may have characteristic length LC1-13, which is the combined length ofthe first through third sections, between 0.7 and 0.9, more preferablybetween 0.75 and 0.85, still more preferably between 0.78 and 0.8 of thetotal length L1-13, with a maximum diameter to characteristic lengthratio between 1.15 and 1.3, more preferably between 1.2 and 1.27, andstill more preferably between 1.22 and 1.25. The threaded mount adapterTMA-13 may be used in combination with the large UMFDs. The firstsection may have a length a-13 and diameter Da-13, the second sectionwith a length b-13 and a diameter Db-13, the third section with a lengthc-13 and a diameter Dc-13 equal to Da-13, and the fourth section with alength d-13 and an end diameter Dd-13. HL-13 may be between 0.4 and 1.1,more preferably between 0.5 and 1, still more preferably between 0.6 and0.93 of L1-13. Dt-13 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-13 may have a maximum diameter to a maximum depth.

Referring to FIGS. 29A-29D, a fourteenth threaded mount adapter TMA-14may have characteristic length LC1-14, which is the combined length ofthe first through third sections, between 0.55 and 0.75, more preferablybetween 0.6 and 0.7, still more preferably between 0.64 and 0.68 of thetotal length L1-14, with a maximum diameter to characteristic lengthratio between 1.9 and 2.25, more preferably between 2 and 2.15, andstill more preferably between 2.05 and 2.1. The threaded mount adapterTMA-14 may be used in combination with the large UMFDs. The firstsection may have a length a-14 and diameter Da-14, the second sectionwith b-14 and a diameter Db-14, the third section with a length c-14 anda diameter Dc-14 equal to Da-14, and the fourth section with a lengthd-14 and an end diameter Dd-14. HL-14 may be between 0.75 and 1.45, morepreferably between 0.8 and 1.4, still more preferably between 0.88 and1.31 of L1-14. Dt-14 may be threaded with a female thread. The fourthsection may be threaded with a male thread, and end chamfers. The centerdrill hole CDH-14 may have a maximum diameter of to a maximum depth.

Referring to FIGS. 30A-30D, a fifteenth threaded mount adapter TMA-15may have characteristic length LC1-15, which is the combined length ofthe first through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.8, still more preferably between 0.75 and 0.77 oftotal length L1-15, with a maximum diameter to characteristic lengthratio between 1.2 and 1.45, more preferably between 1.25 and 1.4, andstill more preferably between 1.3 and 1.35. The threaded mount adapterTMA-15 may be used in combination with the large UMFDs. The firstsection may have a length a-15 and diameter Da-15, the second sectionwith a length b-15 and a diameter Db-15, the third section with a lengthc-15 and a diameter Dc-15 equal to Da-15, and the fourth section with alength d-15 and an end diameter Dd-15. HL-15 may be between 0.55 and1.05, more preferably between 0.6 and 1, still more preferably between0.625 and 0.96 of L1-15. Dt-15 may be threaded with a female thread. Thefourth section may be threaded with a male thread, and end chamfers. Thecenter drill hole CDH-15 may have a maximum diameter to a maximum depth.The depth Dm-15 of the bore may be followed by a conical countersink.

Referring to FIGS. 31A-31D, a sixteenth threaded mount adapter TMA-16may have characteristic length LC1-16, which is the combined length ofthe first through third sections, between 0.5 and 0.75, more preferablybetween 0.55 and 0.7, still more preferably between 0.59 and 0.65 of thetotal length L1-16, with a maximum diameter to characteristic lengthratio between 2.5 and 2.75, more preferably between 2.55 and 2.7, andstill more preferably between 2.6 and 2.65. The threaded mount adapterTMA-16 may be used in combination with the large UMFDs. The firstsection may have a length a-16 and diameter Da-16, the second sectionwith a length b-16 and a diameter Db-16, the third section with a lengthc-16 and a diameter Dc-16 equal to Da-16, and the fourth section with alength d-16 and an end diameter Dd-16. HL-16 may be between 0.9 and1.76, more preferably between 1 and 1.66, still more preferably between1.1 and 1.56 of the total length L1-16. Dt-16 may be threaded with afemale thread. The fourth section may be threaded with a male thread,and end chamfers. The center drill hole CDH-16 may have a maximumdiameter to a maximum depth. The depth Dt-16 of the female threadedportion may be followed by a first cylindrical countersink. The firstcylindrical countersink may be followed by a second cylindricalcountersink.

Referring to FIGS. 32A-32D, a seventeenth threaded mount adapter TMA-17may have characteristic length LC1-17, which is the combined length ofthe first through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.8, still more preferably between 0.76 and 0.78 of thetotal length L1-17, with a maximum diameter to characteristic lengthratio between 1.9 and 2.2, more preferably between 1.95 and 2.15, andstill more preferably between 2 and 2.1. The threaded mount adapterTMA-17 may be used in combination with the small UMFDs. The firstsection may have a length a-17 and diameter Da-17, the second sectionwith a length b-17 and a diameter Db-17, the third section with a lengthc-17 and a diameter Dc-17 equal to Da-17, and the fourth section with alength d-17 and an end diameter Dd-17. HL-17 may be between 0.75 and1.5, more preferably between 0.8 and 1.45, still more preferably between0.88 and 1.39 of the total length L1-17. Dt-17 may be threaded with afemale thread. The fourth section may be threaded with a male thread,and end chamfers. The center drill hole CDH-17 may have a maximumdiameter to a maximum depth.

Referring to FIGS. 33A-33D, an eighteenth threaded mount adapter TMA-18may have characteristic length LC1-18, which is the combined length ofthe first through third sections, between 0.6 and 0.9, more preferablybetween 0.66 and 0.83, still more preferably between 0.71 and 0.78 ofthe total length L1-18, with a maximum diameter to characteristic lengthratio between 1.65 and 1.85, more preferably between 1.7 and 1.8, andstill more preferably between 1.72 and 1.76. The threaded mount adapterTMA-18 may be used in combination with the small UMFDs. The firstsection may have a length a-18 and diameter Da-18, the second sectionwith a length b-18 and a diameter Db-18, the third section with a lengthc-18 and a diameter Dc-18 equal to Da-18, and the fourth section with alength d-18 and an end diameter Dd-18. HL-18 may be between 0.8 and 1.5,more preferably between 0.82 and 1.3, still more preferably between 0.83and 1.2 of the total length L1-18. Dt-18 may be threaded with a femalethread. The fourth section may be threaded with a male thread, and endchamfers. The center drill hole CDH-18 may have a maximum diameter to amaximum depth.

Referring to FIGS. 34A-34D, a nineteenth threaded mount adapter TMA-19may have characteristic length LC1-19, which is the combined length ofthe first through third sections, between 0.7 and 0.9, more preferablybetween 0.75 and 0.85, still more preferably between 0.78 and 0.8 of thetotal length L1-19, with a maximum diameter to characteristic lengthratio between 1.25 and 1.4, more preferably between 1.3 and 1.38, andstill more preferably between 1.32 and 1.36. The threaded mount adapterTMA-19 may be used in combination with the small UMFDs. The firstsection may have a length a-19 and diameter Da-19, the second sectionwith a length b-19 and a diameter Db-19, the third section with a lengthc-19 and a diameter Dc-19 equal to Da-19, and the fourth section with alength d-19 and an end diameter Dd-19. HL-19 may be between 0.55 and1.15, more preferably between 0.6 and 1.1, still more preferably between0.65 and 1 of the total length L1-19. Dt-19 may be threaded with afemale thread. The fourth section may be threaded with a male thread,and end chamfers. The center drill hole CDH-19 may have a maximumdiameter to a maximum depth. The depth Dm-19 of the bore may be followedby a conical countersink.

Referring to FIGS. 35A-35D, a twentieth threaded mount adapter TMA-20may have characteristic length LC1-20, which is the combined length ofthe first through third sections, between 0.5 and 0.75, more preferablybetween 0.55 and 0.7, still more preferably between 0.61 and 0.67 of thetotal length L1-20, with a maximum diameter to characteristic lengthratio between 2.55 and 2.85, more preferably between 2.6 and 2.8, andstill more preferably between 2.65 and 2.75. The threaded mount adapterTMA-20 may be used in combination with the small UMFDs. The firstsection may have a length a-20 and diameter Da-20, the second sectionwith a length b-20 and a diameter Db-20, the third section with a lengthc-20 and a diameter Dc-20 equal to Da-20, and the fourth section with alength d-20 and an end diameter Dd-20. HL-20 may be between 1 and 1.8,more preferably between 1.1 and 1.7, still more preferably between 1.15and 1.67 of the total length L1-20. The depth Dt-20 may threaded with afemale thread of type. The fourth section may be threaded with a malethread, and end chamfers. The optional center drill hole CDH-20 may havea maximum diameter to a maximum depth. The depth Dt-20 of the femalethreaded portion may be followed by a cylindrical countersink, withcorners rounded to a maximum radius.

Referring to FIGS. 36A-36E, a twenty-first threaded mount adapter TMA-21may have characteristic length LC1-21, which is the combined length ofthe first through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.8, still more preferably between 0.75 and 0.77 of thetotal length L1-21, with a maximum diameter to characteristic lengthratio between 1.45 and 1.7, more preferably between 1.5 and 1.65, andstill more preferably between 1.55 and 1.6. The threaded mount adapterTMA-21 may be used in combination with the large UMFDs. The firstsection may have a length a-21 and end diameter Da-21, the secondsection with a length b-21 and a diameter Db-21, the third section witha length c-21 and a diameter Dc-21, and the fourth section with a lengthd-21 and an end diameter Dd-21. HL-21 may be between 0.65 and 1.25, morepreferably between 0.7 and 1.2, still more preferably between 0.75 and1.13 the total length L1-21. A groove G-21 may be present in the firstsection, adjacent to the second section. The first section may bethreaded with a male thread and may comprise end chamfers. The fourthsection may be threaded with a male thread, and end chamfers. Theoptional center drill hole CDH-21 may have a maximum diameter to amaximum depth with a conical countersink. The first section may be boredout. In addition, a square bore with side may be made, and the cornersmay be rounded to a maximum radius. Finally, a countersink may beapplied.

Referring to FIGS. 37A-37E, a twenty-second threaded mount adapterTMA-22 may have characteristic length LC1-22, which is the combinedlength of the first through third sections, between 0.6 and 0.85, morepreferably between 0.65 and 0.8, still more preferably between 0.72 and0.75 of the total length L1-22, with a maximum diameter tocharacteristic length ratio between 1.45 and 1.7, more preferablybetween 1.5 and 1.65, and still more preferably between 1.55 and 1.69.The threaded mount adapter TMA-22 may be used in combination with thesmall UMFDs. The first section may have a length a-22 and end diameterDa-22, the second section with a length b-22 and a diameter Db-22, thethird section with a length c-22 and a diameter Dc-22, and the fourthsection with a length d-22 and an end diameter Dd-22. HL-22 may bebetween 0.65 and 1.25, more preferably between 0.7 and 1.2, still morepreferably between 0.75 and 1.13 of the total length L1-22. A grooveG-22 may be present in the first section, adjacent to the secondsection. The first section may be threaded with a male thread and maycomprise end chamfers. The fourth section may be threaded with a malethread, and end chamfers. The optional center drill hole CDH-22 may havea maximum diameter to a maximum depth with a conical countersink. Thefirst section may be bored out. In addition, a square bore may be made,where the corners may be rounded to a maximum radius. Finally, acountersink may be applied.

Referring to FIGS. 38A-38D, a twenty-third threaded mount adapter TMA-23may have characteristic length LC1-23, which is the combined length ofthe first through third sections, between 0.65 and 0.85, more preferablybetween 0.7 and 0.8, still more preferably between 0.73 and 0.75 of thetotal length L1-23, with a maximum diameter to characteristic lengthratio between 1.55 and 1.85, more preferably between 1.6 and 1.8, andstill more preferably between 1.65 and 1.75. The threaded mount adapterTMA-23 may be used in combination with the small UMFDs. The firstsection may have a length a-23 and diameter Da-23, the second sectionwith a length b-23 and a diameter Db-23, the third section with a lengthc-23 and a diameter Dc-23 equal to Da-23, and the fourth section with alength d-23 and an end diameter Dd-23. HL-23 may be between 0.65 and1.35, more preferably between 0.7 and 1.3, still more preferably between0.78 and 1.25 the total length L1-23. Dt-23 may be threaded with afemale thread. The fourth section may be threaded with a male thread,and end chamfers. The center drill hole CDH-23 may have a maximumdiameter to a maximum depth.

Referring to FIGS. 5A-5D a flange and bolt type mount adapter FBMA mayhave an overall circular shape, with total length L2, and at most fourlongitudinal sections. The mount adapter may have a characteristiclength LC2, which is the combined length of the first through the thirdsections. The first section may have width w1 and end diameter d1, thesecond section may have width w2 and outer diameter d2, the thirdsection may have width w3 and outer diameter d3, and the fourth sectionmay have width w4 and end diameter d4. The first section may have atleast one bore with a chamfer and an inner diameter db1, and may have asecond bore with diameter db2. An optional drill relief Rf may bepermissible for the first bore. The second bore may end with a conicalcountersink. Up to two series of holes may be present and located atdiameters dh1 and dh2. Up to two series of slots may also be presentwith a circular portion centered at diameters ds1 and ds2, respectively,with widths W1 and W2, spaced at angle θ3 from each other respectively,the angle θ3 measured from slot centerline to slot centerline. Up to twoseries of semi-circular notches may also be present at the periphery ofa section, with radii Rn1 and Rn2, respectively. The fourth section maybe threaded with a male thread. An optional center drill hole CDH2 maybe present in the fourth section. The fourth section may comprise achamfer on its end furthest from the third section. For each exemplaryembodiment, reference characters may be further distinguished by anumeric suffix, i.e., dh1-1 for hole diameter dh1 in a first embodimentof a flange and bolt type mount adapter.

FIGS. 39A-D depict a first flange and bolt mount adapter FBMA-1 withcharacteristic length LC2-1 between 0.45 and 0.8, more preferablybetween 0.5 and 0.75, still more preferably between 0.58 and 0.68 of thetotal length L2-1, used in combination with large UMFDs. The firstsection width w1-1 may have a diameter d1-1, the second section widthw2-1 may have a diameter d2-1, the third section width w3-1 may have adiameter d3-1, and the fourth section width w4-1 may have a diameterd4-1, with a maximum diameter to characteristic length ratio between3.75 and 4.25, more preferably between 3.8 and 4.2, and still morepreferably between 3.9 and 4.1. The transition between third and fourthsections may be a wide groove with slope towards the fourth section. Thefirst section may have one bore B1-1 with an external chamfer, a depthand an inner diameter db1-1. An optional drill relief Rf-1 may bepermissible for the first bore B1-1 with a maximum diameter and amaximum depth. A first series of six slots S1-1 may be present with acircular portion C1-1 centered at a diameter ds1-1, with a width W1-1,evenly spaced with an angle between each slot centerline. A first seriesof six notches N1-1 on the second section may correspond to the firstseries of slots, where each notch may be aligned with a slot from thefirst series S1-1 and with a radius Rn1-1. A second series of six slotsS2-1 may be present with a circular portion C2-1 centered at a diameterds2-1, with a width W2-1, evenly spaced with an angle between each slotcenterline. A second series of six notches N2-1 on the second sectionmay correspond to a series of slots, such that each notch may be alignedwith a slot of the second series S2-1, with a radius Rn2-1. The fourthsection may be threaded with a male thread. The optional center drillhole CDH2-1 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 40A-D depict a second flange and bolt mount adapter FBMA-2 withcharacteristic length LC2-2 between 0.35 and 0.55, more preferablybetween 0.4 and 0.5, still more preferably between 0.45 and 0.46 of thetotal length L2-2, used in combination with large UMFDs. The firstsection width w1-2 may have a diameter d1-2, the second section widthw2-2 may be 0″, the third section width w3-2 may have a diameter d3-2,and the fourth section width w4-2 a diameter d4-2, with a maximumdiameter to characteristic length ratio between 6.5 and 9, morepreferably between 7 and 8.5, and still more preferably between 7.7 and7.8. The transition between third and fourth sections may be a groovewith slope towards the fourth section. The first section may have afirst bore B1-2 with an external chamfer, a depth and an inner diameterdb1-2. A first series of six slots S1-2 may be present with circularportion C1-2 located at an inner diameter ds1-2, with a width W1-2,evenly spaced with an angle of between each slot centerline. A secondseries of six slots S2-2 may be present with circular portion C2-2located at an inner diameter ds2-2, with a width W2-2, evenly spacedwith an angle of between each slot centerline. A series of six holesH1-2 may be located at a diameter dh1-2, spaced evenly with between eachhole. Each hole may be threaded. To slots of the first series S1-2 maycorrespond notches N1-2 present in the third section, with a radiusRn1-2. Similarly, to slots of the second series S2-2 may correspondnotches N2-2 present in the third section, with a radius Rn2-2. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-2 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 41A-E depict a third flange and bolt mount adapter FBMA-3 withcharacteristic length LC2-3 between 0.4 and 0.65, more preferablybetween 0.45 and 0.6, still more preferably between 0.5 and 0.55 of thetotal length L2-3, used in combination with small UMFDs. The firstsection width w1-3 may have a diameter d1-3, the second section widthw2-3 may be 0″, the third section width w3-3 may have a diameter d3-3,and the fourth section width w4-3 a diameter d4-3, with a maximumdiameter to characteristic length ratio between 7 and 9, more preferablybetween 7.5 and 8.5, and still more preferably between 7.8 and 8. Thetransition between third and fourth sections may be a wide groove withslope towards the fourth section. The first section may have a firstbore B1-3 with an external chamfer, a depth and an inner diameter db1-3.A first series of six holes H1-3 may be located at a diameter dh1-3,spaced evenly with between each hole. Each hole may be threaded. Asecond series of six holes H2-3 may be located at a diameter dh2-3 andthreaded. Two series of six slots, a first series S1-3, and a secondseries S2-3 may be also machined into the first section, as shown inFIGS. 41A-41E. To each pair of slots may correspond a notch N1-3 presentin the third section, as shown in FIGS. 41A-41E. The fourth section maybe threaded with a male thread. The optional center drill hole CDH2-3may have a maximum diameter to a maximum depth with a conicalcountersink.

FIGS. 42A-F depict a fourth flange and bolt mount adapter FBMA-4 withcharacteristic length LC2-4 between 0.7 and 0.9, more preferably between0.75 and 0.85, still more preferably between 0.81 and 0.83 of the totallength L2-4, used in combination with large UMFDs. The first sectionwidth w1-4 with a diameter d1-4, the second section width w2-4 may havea diameter d2-4, the third section width w3-4 may have a diameter d3-4,and the fourth section width w4-4 may have a diameter d4-4, with amaximum diameter to characteristic length ratio between 1 and 1.8, morepreferably between 1.2 and 1.6, and still more preferably between 1.3and 1.5. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may havea first bore B1-4 with an external chamfer, a depth and an innerdiameter db1-4. A second bore B2-4 may have a diameter db2-4, a depthand a countersink. A square bore Bc-4 may be machined over the secondcircular bore B2-4, its corners rounded to a maximum radius. An optionaldrill relief Rf-4 may be permissible for the first bore B1-4. The secondbore B2-4 may end with a conical countersink. A series of four holesH1-4 may be located at a diameter dh1-4, spaced evenly with between eachhole. The fourth section may be threaded with a male thread.

FIGS. 43A-F depict a fifth flange and bolt mount adapter FBMA-5 withcharacteristic length LC2-5 between 0.6 and 0.9, more preferably between0.65 and 0.85, still more preferably between 0.70 and 0.79 of the totallength L2-5, used in combination with large UMFDs. The first sectionwidth w1-5 may have a diameter d1-5, the second section width w2-5 maybe 0″, the third section width w3-5 may have a diameter d3-5, and thefourth section width w4-5 may have a diameter d4-5, with a maximumdiameter to characteristic length ratio between 1.8 and 2.3, morepreferably between 1.95 and 2.15, and still more preferably between 1.99and 2.1. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-5 with an external chamfer, a depth and an inner diameterdb1-5, and a second bore B2-5 with a diameter db2-5, a depth and acountersink. A square bore Bc-5 may be machined over the second circularbore B2-5 to a depth, its corners rounded to a maximum radius. Anoptional drill relief Rf-5 may be permissible for the first bore B1-5.The second bore B2-5 may end with a conical countersink. A series ofholes H1-5 may be located at a diameter dh1-5, spaced evenly betweeneach hole. The fourth section may be threaded with a male thread. Theoptional center drill hole CDH2-5 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 44A-F depict a sixth flange and bolt mount adapter FBMA-6 withcharacteristic length LC2-6 between 0.75 and 0.95, more preferablybetween 0.8 and 0.92, still more preferably between 0.83 and 0.89 of thetotal length L2-6, used in combination with large UMFDs. The firstsection width w1-6 may have a diameter d1-6, the second section widthw2-6 may be 0″, the third section width w3-6 may have a diameter d3-6,and the fourth section width w4-6 may have a diameter d4-6, with amaximum diameter to characteristic length ratio between 0.75 and 1.3,more preferably between 0.85 and 1.15, and still more preferably between0.95 and 1.05. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-6 with an external chamfer, a depth and an inner diameterdb1-6, and a second bore B2-6 with a diameter db2-6, a depth and acountersink. A square bore Bc-6 may be machined to a depth over thesecond circular bore B2-6, its corners rounded to a maximum radius. Anoptional drill relief Rf-6 may be permissible for the first bore B1-6.The second bore B2-6 may end with a conical countersink. A series ofholes H1-6 may be located at a diameter dh1-6, spaced evenly betweeneach hole. The fourth section may be threaded with a male thread. Theoptional center drill hole CDH2-6 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 45A-F depict a seventh flange and bolt mount adapter FBMA-7 withcharacteristic length LC2-7 between 0.7 and 0.9, more preferably between0.74 and 0.85, still more preferably between 0.79 and 0.8 the totallength L2-7, used in combination with small UMFDs. The first sectionwidth w1-7 may have a diameter d1-7, the second section width w2-7 maybe 0″, the third section width w3-7 may have a diameter d3-7, and thefourth section width w4-7 may have a diameter d4-7, with a maximumdiameter to characteristic length ratio between 1.8 and 2.31, morepreferably between 1.95 and 2.16, and still more preferably between 2.02and 2.04. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-7 with an external chamfer, a depth and an inner diameterdb1-7. A second bore B2-7 may have a diameter db2-7, a depth and acountersink. A square bore Bc-7 may be machined over the second circularbore B2-7, its corners rounded to a maximum radius. An optional drillrelief Rf-7 may be permissible for the first bore B1-7. The second boreB2-7 may end with a conical countersink. A first series of fourrectangular slots S1-7 may be present with an inner diameter ds1-7, witha width W1-7, evenly spaced with an angle between each slot centerline.A second series of six rectangular slots S2-7 may be present with aninner diameter ds2-7, with a width W2-7, evenly spaced with an anglebetween each slot centerline. The innermost face of all rectangularslots may be rounded with a radius. A series of six notches N2-7 on thesecond section may correspond to the second series of slots S2-7, andeach notch may be aligned with a second series slot, with a radiusRn2-7. The fourth section may be threaded with a male thread. Theoptional center drill hole CDH2-7 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 46A-D depict an eighth flange and bolt mount adapter FBMA-8 withcharacteristic length LC2-8 between 0.4 and 0.7, more preferably between0.45 and 0.65, still more preferably between 0.5 and 0.6 of the totallength L2-8, used in combination with small UMFDs. The first sectionwidth w1-8 may have a diameter d1-8, the second section width w2-8 maybe 0″, the third section width w3-8 may have a diameter d3-8, and thefourth section width w4-8 may have a diameter d4-8, with a maximumdiameter to characteristic length ratio between 5 and 7.5, morepreferably between 6 and 6.7, and still more preferably between 6.3 and6.5. The transition between third and fourth sections may be a groovewith slope towards the fourth section. The first section may have onebore B1-8 with an external chamfer, a depth and an inner diameter db1-8.An optional drill relief Rf-8 may be permissible for the first bore B1-8with a maximum diameter and a maximum depth. A first series of fourslots S1-8 may be present with a circular portion C1-8 located at adiameter ds1-8, with a width W1-8, evenly spaced with an angle betweeneach slot centerline. A first series of four notches N1-8 may be locatedon the third section, and each notch may be aligned with a first seriesslot, with a radius Rn1-8. A second series of four slots S2-8 may bepresent with a circular portion C2-8 located at an inner diameter ds2-8,with a width W2-8, evenly spaced with an angle between each slotcenterline. A second series of four notches N2-8 on the third sectionmay correspond to the second series of slots S2-8, and each notch may bealigned with a second series slot, with a radius Rn2-8. The fourthsection may be threaded with a male thread. The optional center drillhole CDH2-8 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 47A-D depict a ninth flange and bolt mount adapter FBMA-9 withcharacteristic length LC2-9 between 0.7 and 0.9, more preferably between0.75 and 0.85, still more preferably between 0.81 and 0.83 of the totallength L2-9, used in combination with large UMFDs. The first sectionwidth w1-9 may have a diameter d1-9, the second section width w2-9 mayhave a diameter d2-9, the third section width w3-9 may have a diameterd3-9, and the fourth section width w4-9 may have a diameter d4-9, with amaximum diameter to characteristic length ratio between 1.5 and 2, morepreferably between 1.6 and 1.9, and still more preferably between 1.75and 1.79. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-9 with an external chamfer, a depth and an inner diameterdb1-9. A first series of six slots S1-9 may be present with a circularportion C1-9 at a diameter ds1-9, with a width W1-9, evenly spaced withan angle between each slot centerline. A second series of six slots S2-9may be present with a circular portion C2-9 diameter ds2-9, with a widthW2-9, evenly spaced with an angle between each slot centerline. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-9 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 48A-D depict a tenth flange and bolt mount adapter FBMA-10 withcharacteristic length LC2-10 between 0.6 and 0.8, more preferablybetween 0.65 and 0.77, still more preferably between 0.72 and 0.72 thetotal length L2-10, used in combination with large UMFDs. The firstsection width w1-10 may have a diameter d1-10, the second section widthw2-10 may have a diameter d2-10, the third section width w3-10 may havea diameter d3-10, and the fourth section width w4-10 may have a diameterd4-10, with a maximum diameter to characteristic length ratio between 2and 3, more preferably between 2.55 and 2.8, and still more preferablybetween 2.65 and 2.69. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have one bore B1-10 with an external chamfer, a depth and an innerdiameter db1-10. A first series of six slots S1-10 may be present with acircular portion C1-10 located at a diameter ds1-10, with a width W1-10,evenly spaced with an angle between each slot centerline. A secondseries of six slots S2-10 may be present with a circular portion C2-10located at a diameter ds2-10, with a width W2-10, evenly spaced with anangle between each slot centerline. The fourth section may be threadedwith a male thread. The optional center drill hole CDH2-10 may have amaximum diameter to a maximum depth with a conical countersink.

FIGS. 49A-E depict an eleventh flange and bolt mount adapter FBMA-11with characteristic length LC2-11 between 0.55 and 0.8, more preferablybetween 0.6 and 0.75, still more preferably between 0.67 and 0.7 thetotal length L2-11, used in combination with large UMFDs. The firstsection width w1-11 may have a diameter d1-11, the second section widthw2-11 may have a diameter d2-11, the third section width w3-11 may havea diameter d3-11, and the fourth section width w4-11 may have a diameterd4-11, with a maximum diameter to characteristic length ratio between2.5 and 4, more preferably between 3 and 3.5, and still more preferablybetween 3.2 and 3.25. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have one lip, an external chamfer, and a lip diameter. In addition,the first section may comprise a bore B1-11 with a diameter db1-11, adepth and a countersink. A square bore Bc-11 may be machined over thecircular bore B1-11, its corners rounded to a maximum radius. The boreB1-11 may end with a conical countersink. A series of six holes H1-11may be located at a diameter dh1-11, spaced evenly between each hole.The fourth section may be threaded with a male thread. The optionalcenter drill hole CDH2-11 may have a maximum diameter to a maximum depthwith a conical countersink.

FIGS. 50A-E depict a twelfth flange and bolt mount adapter FBMA-12 withcharacteristic length LC2-12 between 0.4 and 0.65, more preferablybetween 0.45 and 0.58, still more preferably between 0.5 and 0.53 of thetotal length L2-12, used in combination with large UMFDs. The firstsection width w1-12 may have a diameter d1-12, the second section widthw2-12 may be 0″, the third section width w3-12 may have a diameterd3-12, and the fourth section width w4-12 may have a diameter d4-12,with a maximum diameter to characteristic length ratio between 5 and 6,more preferably between 5.25 and 5.5, and still more preferably between5.35 and 5.39. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may havea lip with an external chamfer. A bore B1-12 in the first section mayhave a diameter db1-12, and a countersink. A square bore Bc-12 may bemachined over the circular bore B1-12, its corners rounded to a maximumradius. The bore B1-12 may end with a conical countersink. A firstseries of six slots S1-12 may be present with circular portion C1-12located at an inner diameter ds1-12, with a width W1-12, evenly spacedwith an angle between each slot centerline. The fourth section may bethreaded with a male thread. The optional center drill hole CDH2-12 mayhave a maximum diameter to a maximum depth with a conical countersink.

FIGS. 51A-D depict a thirteenth flange and bolt mount adapter FBMA-13with characteristic length LC2-13 between 0.5 and 0.7, more preferablybetween 0.55 and 0.65, still more preferably between 0.61 and 0.625 ofthe total length LC2-13, used in combination with large UMFDs. The firstsection width w1-13 may have a diameter d1-13, the second section widthw2-13 may be 0″, the third section width w3-13 may have a diameterd3-13, and the fourth section width w4-13 may have a diameter d4-13,with a maximum diameter to characteristic length ratio between 3.5 and5, more preferably between 4 and 4.5, and still more preferably between4.2 and 4.3. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-13 with an external chamfer, a depth and an inner diameterdb1-13. An optional drill relief Rf-13 may be permissible for the firstbore B1-13. A first series of six slots S1-13 may be present withcircular portion C1-13 located at a diameter ds1-13, with a width W1-13,evenly spaced with an angle between each slot centerline. A secondseries of six slots S2-13 may be present with a circular portion C2-13located at a diameter ds2-13, with a width W2-13, evenly spaced with anangle between each slot centerline. A series of six notches N1-13 may belocated on the third section, and each notch may be aligned with a firstseries slot S1-13, with a radius Rn1-13. The fourth section may bethreaded with a male thread. The optional center drill hole CDH2-13 mayhave a maximum diameter to a maximum depth with a conical countersink.

FIGS. 52A-D depict a fourteenth flange and bolt mount adapter FBMA-14with characteristic length LC2-14 between 0.7 and 0.9, more preferablybetween 0.75 and 0.85, still more preferably between 0.79 and 0.8 of thetotal length L2-14, used in combination with large UMFDs. The firstsection width w1-14 may have a diameter d1-14, the second section widthw2-14 may have a diameter d2-14, the third section width w3-14 may havea diameter d3-14, and the fourth section width w4-14 may have a diameterd4-14, with a maximum diameter to characteristic length ratio between1.5 and 2.5, more preferably between 1.75 and 2.1, and still morepreferably between 1.85 and 1.95. The transition between third andfourth sections may be a groove with slope towards the fourth section.The first section may have a first bore B1-14 with an external chamfer,a depth and an inner diameter db1-14. A series of six slots S1-14 may bepresent with circular portion C1-14 located at an inner diameter ds1-14,with a width W1-14, evenly spaced with an angle between each slotcenterline. The fourth section may be threaded with a male thread. Theoptional center drill hole CDH2-14 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 53A-D depict a fifteenth flange and bolt mount adapter FBMA-15with characteristic length LC2-15 between 0.6 and 0.8, more preferablybetween 0.65 and 0.71, still more preferably between 0.67 and 0.69 thetotal length L2-15, used in combination with small UMFDs. The firstsection width w1-15 may have a diameter d1-15, the second section widthw2-15 may have a diameter d2-15, the third section width w3-15 may havea diameter d3-15, and the fourth section width w4-15 may have a diameterd4-15, with a maximum diameter to characteristic length ratio between2.5 and 4.5, more preferably between 3 and 4, and still more preferablybetween 3.5 and 3.7. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have a first bore B1-15 with an external chamfer, a depth and aninner diameter db1-15. A series of six slots S1-15 may be present withcircular portion C1-15 located at an inner diameter ds1-15, with a widthW1-15, evenly spaced with an angle between each slot centerline. Aseries of six holes H1-15 may be located at a diameter dh1-15, spacedevenly between each hole, and each hole equidistant from two slots. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-15 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 54A-D depict a sixteenth flange and bolt mount adapter FBMA-16with characteristic length LC2-16 between 0.7 and 0.9, more preferablybetween 0.75 and 0.87, still more preferably between 0.8 and 0.82 of thetotal length L2-16, used in combination with small UMFDs. The firstsection width w1-16 may have a diameter d1-16, the second section widthw2-16 may have a diameter d2-16, the third section width w3-16 may havea diameter d3-16, and the fourth section width w4-16 may have a diameterd4-16, with a maximum diameter to characteristic length ratio between2.65 and 3, more preferably between 2.7 and 2.95, and still morepreferably between 2.8 and 2.85. The transition between third and fourthsections may be a groove with slope towards the fourth section. Thefirst section may have one bore B1-16 with an external chamfer, and aninner diameter db1-16. A first series of six holes H1-16 may be locatedat a diameter dh1-16, spaced evenly between each hole. Two additionalholes AdH-16 may be positioned with 180° between each hole. The fourthsection may be threaded with a male thread. The optional center drillhole CDH2-16 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 55A-D depict a seventeenth flange and bolt mount adapter FBMA-17with characteristic length LC2-17 between 0.75 and 0.95, more preferablybetween 0.8 and 0.9, still more preferably between 0.84 and 0.86 thetotal length L2-17, used in combination with small UMFDs. The firstsection width w1-17 may have a diameter d1-17, the second section widthw2-17 may have a diameter d2-17, the third section width w3-17 may havea diameter d3-17, and the fourth section width w4-17 may have a diameterd4-17, with a maximum diameter to characteristic length ratio between1.85 and 2.15, more preferably between 1.9 and 2.1, and still morepreferably between 1.98 and 2.02. The transition between third andfourth sections may be a groove with slope towards the fourth section.The first section may have a bore B1-17 with an external chamfer, and aninner diameter db1-17. A series of four slots S1-17 may be present withinner circular portion C1-17 located at an inner diameter ds1-17 withouter circular portion C1 b-17 located at an outer diameter, evenlyspaced between each slot centerline. A first series of four holes H1-17may be located at a diameter dh1-17, spaced evenly between each hole,with corresponding notches N2-17 with radius Rn2-17. A second series offour holes H2-17 may be located at a diameter dh2-17. To each slot S1-17may correspond a notch N1-17 present in the second section, with aradius Rn1-17. The fourth section may be threaded with a male thread.The optional center drill hole CDH2-17 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 56A-F depict an eighteenth flange and bolt mount adapter FBMA-18with characteristic length LC2-18 between 0.65 and 0.95, more preferablybetween 0.7 and 0.88, still more preferably between 0.78 and 0.8 of thetotal length L2-18, used in combination with large UMFDs. The firstsection width w1-18 may have a diameter d1-18, the second section widthw2-18 may be 0″, the third section width w3-18 may have a diameterd3-18, and the fourth section width w4-18 may have a diameter d4-18,with a maximum diameter to characteristic length ratio between 1.3 and1.8, more preferably between 1.4 and 1.7, and still more preferablybetween 1.5 and 1.6. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have a first bore B1-18 with an external chamfer, a depth and aninner diameter db1-18. An optional drill relief Rf-18 may be permissiblefor the first bore B1-18 with a maximum diameter and a maximum depth. Aseries of four slots S1-18 may be present with circular portion C1-18located at a diameter ds1-18, with a width W1-18, evenly spaced with anangle between each slot centerline. A second bore B2-18 may be machinedwith a diameter db2-18, and a depth. A square bore Bc-18 may be machinedover the second circular bore B2-18, its corners rounded to a maximumradius. The second bore B2-18 may end with a conical countersink. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-18 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 57A-D depict a nineteenth flange and bolt mount adapter FBMA-19with characteristic length LC2-19 between 0.75 and 0.95, more preferablybetween 0.8 and 0.9, still more preferably between 0.83 and 0.84 of thetotal length L2-19, used in combination with large UMFDs. The firstsection width w1-19 may have a diameter d1-19, the second section widthw2-19 may have a diameter d2-19, the third section width w3-19 may havea diameter d3-19, and the fourth section width w4-19 may have a diameterd4-19, with a maximum diameter to characteristic length ratio between 1and 1.5, more preferably between 1.15 and 1.35, and still morepreferably between 1.2 and 1.3. The transition between second and thirdsections may be a slope. The transition between third and fourthsections may be a groove with slope towards the fourth section. Thefirst section may have one bore B1-19 with an external chamfer, a depthand an inner diameter db1-19. A series of four holes H1-19 may belocated at a diameter dh1-19, spaced evenly between each hole. Oppositetwo holes from the H1-19 series the surface OpA-19 of the third sectionmay be flattened. The fourth section may be threaded with a male thread.The optional center drill hole CDH2-19 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 58A-F depict a twentieth flange and bolt mount adapter FBMA-20with characteristic length LC2-20 between 0.2 and 0.4, more preferablybetween 0.25 and 0.35, still more preferably between 0.27 and 0.31 thetotal length L2-20, used in combination with large UMFDs. The firstsection width w1-20 may have a diameter d1-20, the second section widthw2-20 may be 0″, the third section width w3-20 may have a diameterd3-20, and the fourth section width w4-20 may have a diameter d4-20,with a maximum diameter to characteristic length ratio between 2.5 and4.5, more preferably between 3 and 3.7, and still more preferablybetween 3.3 and 3.4. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have one bore B1-20 with an external chamfer, a depth and an innerdiameter db1-20. A second bore B2-20 may be machined with a diameterdb2-20, and a depth. A square bore Bc-20 may be machined over the secondcircular bore B2-20, its corners rounded to a maximum radius. The secondbore B2-20 may end with a conical countersink. A first series of fourholes H1-20 may be located at a diameter dh1-20, spaced evenly betweeneach hole. A second series of four holes H2-20 may be positioned at adh2-20 diameter, such that there may be eight evenly spaced holes. Tothe holes in the first series H1-20 may correspond semi-circular notchesN1-20 on the third section outer diameter. To each hole in the secondseries H2-20 may correspond a semi-circular notch N2-20 on the thirdsection outer diameter. Facing two opposing holes from the first seriestwo faces OpA-20 of the third section may be flattened over a depth. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-20 may have a maximum diameter to a maximum depth with aconical countersink.

FIGS. 59A-E depict a twenty-first flange and bolt mount adapter FBMA-21with characteristic length LC2-21 between 0.7 and 0.9, more preferablybetween 0.75 and 0.85, still more preferably between 0.79 and 0.81 ofthe total length L2-21, used in combination with large UMFDs. The firstsection width w1-21 may have a diameter d1-21, the second section widthw2-21 may have a diameter continuously decreasing between d1-21 andd2-21, the third section width w3-21 may have a diameter d3-21, and thefourth section width w4-21 may have a diameter d4-21. The transitionbetween third and fourth sections may be a groove with slope towards thefourth section. The first section may have one bore B1-21 with anexternal chamfer, a depth and an inner diameter db1-21, with a maximumdiameter to characteristic length ratio between 2 and 3, more preferablybetween 2.25 and 2.75, and still more preferably between 2.5 and 2.6. Acone-frustum shaped second bore B2-21 may be present. A series of fourholes H1-21 may be located in the first section at a diameter dh1-21,spaced evenly between each hole. Four additional holes AdH-21 located onthe second section may be threaded and located at the same diameterdh1-21. The third section may be machined with two flat surfaces OpA-21facing holes from the first series H1-21, and opposite to each other.The fourth section may be threaded with a male thread. The optionalcenter drill hole CDH2-21 may have a maximum diameter to a maximum depthwith a conical countersink.

FIGS. 60A-E depict a twenty-second flange and bolt mount adapter FBMA-22with characteristic length LC2-22 between 0.7 and 0.95, more preferablybetween 0.75 and 0.9, still more preferably between 0.8 and 0.83 of thetotal length L2-22, used in combination with small UMFDs. The firstsection width w1-22 may have a diameter d1-22, the second section widthw2-22 may have a diameter d2-22, the third section width w3-22 may havea diameter d3-22, and the fourth section width w4-22 may have a diameterd4-22, with a maximum diameter to characteristic length ratio between 1and 1.8, more preferably between 1.3 and 1.5, and still more preferablybetween 1.35 and 1.45. The transition between second and third sectionsmay be a slope. The transition between third and fourth sections may bea groove with slope towards the fourth section. The first section mayhave one bore B1-22 with an external chamfer, a depth and an innerdiameter db1-22. A series of four slots S1-22 may be present withcircular portion C1-22 located at a diameter ds1-22, with a width W1-22,evenly spaced with an angle between each slot centerline. The surface ofthe third section may be flattened to form two faces OpA-22 opposite toeach other and facing no slot. The fourth section may be threaded with amale thread. The optional center drill hole CDH2-22 may have a maximumdiameter to a maximum depth with a conical countersink.

FIGS. 61A-F depict a twenty-third flange and bolt mount adapter FBMA-23with characteristic length LC2-23 between 0.55 and 0.85, more preferablybetween 0.6 and 0.8, still more preferably between 0.65 and 0.73 thetotal length L2-23, used in combination with small UMFDs. The firstsection width w1-23 may have a diameter d1-23, the second section widthw2-23 may be 0″, the third section width w3-23 may have a diameterd3-23, and the fourth section width w4-23 may have a diameter d4-23,with a maximum diameter to characteristic length ratio between 2 and 3,more preferably between 2.6 and 2.8, and still more preferably between2.65 and 2.75. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may haveone bore B1-23 with an external chamfer, a depth and an inner diameterdb1-23, and a second bore B2-23 with a diameter db2-23, and a depth. Asquare bore Bc-23 may be machined over the second circular bore B2-23,its corners rounded to a maximum radius. The second bore B2-23 may endwith a conical countersink. A first series of four slots S1-23 may bepresent with a circular portion C1-23 located at a diameter ds1-23, witha width W1-23, evenly spaced with an angle between each slot centerline.A first series of four notches N1-23 may be located on the thirdsection, and each notch N1-23 may be aligned with a slot of the firstseries, with a radius Rn1-23. A second series of four slots S2-23 may bepresent with a circular portion C2-23 located at an inner diameterds2-23, with a width W2-23, evenly spaced with an angle between eachslot centerline. A second series of four notches N2-23 on the thirdsection may correspond to the second series of slots S2-23, and eachnotch N2-23 may be aligned with a slot of the second series, with aradius Rn2-23. The fourth section may be threaded with a male thread.The optional center drill hole CDH2-23 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 62A-E depict a twenty-fourth flange and bolt mount adapter FBMA-24with characteristic length LC2-24 between 0.45 and 0.75, more preferablybetween 0.5 and 0.7, still more preferably between 0.58 and 0.64 of thetotal length L2-24, used in combination with small UMFDs. The firstsection width w1-24 may have a diameter d1-24, the second section widthw2-24 may be 0″, the third section width w3-24 may have a diameterd3-24, and the fourth section width w4-24 may have a diameter d4-24,with a maximum diameter to characteristic length ratio between 3 and 5,more preferably between 3.5 and 4.5, and still more preferably between 4and 4.1. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may havea bore B1-24 with an external chamfer, a depth and an inner diameterdb1-24. A first series of four slots S1-24 may be present with circularportion C1-24 located at an inner diameter ds1-24, with a width W1-24,evenly spaced with an angle between each slot centerline. A secondseries of four slots S2-24 may be present with circular portion C2-24located at an inner diameter ds2-24, with a width W2-24, evenly spacedwith an angle between each slot centerline. A series of four holes H1-24may be located at a diameter dh1-24, spaced evenly between each hole.The series of holes H1-24 may be offset from the first slot seriesS1-24. To each slot of the first series S1-24 may correspond a notchN1-24 present in the third section, with a radius Rn1-24. Similarly, toeach hole of the hole series H1-24 may correspond a notch N2-24 presentin the third section, with a radius Rn2-24. The fourth section may bethreaded with a male thread. The optional center drill hole CDH2-24 mayhave a maximum diameter to a maximum depth with a conical countersink.

FIGS. 63A-D depict a twenty-fifth flange and bolt mount adapter FBMA-25with characteristic length LC2-25 between 0.82 and 0.98, more preferablybetween 0.85 and 0.95, still more preferably between 0.88 and 0.91 ofthe total length L2-25, used in combination with small UMFDs. The firstsection width w1-25 may have a diameter d1-25, the second section widthw2-25 may have a diameter d2-25, the third section width w3-25 may havea diameter d3-25, and the fourth section width w4-25 may have a diameterd4-25, with a maximum diameter to characteristic length ratio between 1and 2, more preferably between 1.3 and 1.6, and still more preferablybetween 1.4 and 1.5. The transition between third and fourth sectionsmay be a groove with slope towards the fourth section. The first sectionmay have a first bore B1-25 with an external chamfer, a depth and aninner diameter db1-25. A series of four slots S1-25 may be present withcircular portion C1-25 located at an inner diameter ds1-25, with a widthW1-25, evenly spaced with an angle between each slot centerline. Thefourth section may be threaded with a male thread. Two surfaces OpA-25of the third section which may not be opposite to a slot may beflattened over a depth. The optional center drill hole CDH2-25 may havea maximum diameter to a maximum depth with a conical countersink.

FIGS. 64A-D depict a twenty-sixth flange and bolt mount adapter FBMA-26with characteristic length LC2-26 between 0.45 and 0.7, more preferablybetween 0.5 and 0.65, still more preferably between 0.58 and 0.62 of thetotal length L2-26, used in combination with small UMFDs. The firstsection width w1-26 may have a diameter d1-26, the second section widthw2-26 may be 0″, the third section width w3-26 may have a diameterd3-26, and the fourth section width w4-26 may have a diameter d4-26,with a maximum diameter to characteristic length ratio between 5 and 7,more preferably between 5.5 and 6.7, and still more preferably between6.1 and 6.2. The transition between third and fourth sections may be agroove with slope towards the fourth section. The first section may havea first bore B1-26 with an external chamfer, a depth and an innerdiameter db1-26. A first series of six slots S1-26 may be present withcircular portion C1-26 located at a diameter ds1-26, with a width W1-26,evenly spaced with an angle between each slot centerline. A secondseries of six slots S2-26 may be present with a circular portion C2-26located at a diameter ds2-26, with a width W2-26, evenly spaced with anangle between each slot centerline. The fourth section may be threadedwith a male thread. The optional center drill hole CDH2-26 may have amaximum diameter to a maximum depth with a conical countersink.

FIGS. 65A-D depict a twenty-seventh flange and bolt mount adapterFBMA-27 with characteristic length LC2-27 between 0.7 and 0.9, morepreferably between 0.75 and 0.85, still more preferably between 0.8 and0.83 of the total length L2-27, used in combination with small UMFDs.The first section width w1-27 may have a diameter d1-27, the secondsection width w2-27 may have a diameter d2-27, the third section widthw3-27 may have a diameter d3-27, and the fourth section width w4-27 mayhave a diameter d4-27, with a maximum diameter to characteristic lengthratio between 1.5 and 3.5, more preferably between 2 and 3, and stillmore preferably between 2.5 and 2.6. The transition between third andfourth sections may be a groove with slope towards the fourth section.The first section may have one bore B1-27 with an external chamfer, adepth and an inner diameter db1-27. A series of four slots S1-27 may bepresent with a circular portion C1-27 located at a diameter ds1-27, witha width W1-27, evenly spaced with an angle between each slot centerline.A series of four notches N1-27 on the third section may correspond tothe series of slots S1-27, and each notch N1-27 may be aligned with aslot S1-27, with a radius Rn1-27. A series of four holes H1-27 may belocated at a diameter dh1-27 and positioned on the first section, suchthat each hole may be equidistant from two slots S1-27. Each hole may bethreaded. The fourth section may be threaded with a male thread. Theoptional center drill hole CDH2-27 may have a maximum diameter to amaximum depth with a conical countersink.

FIGS. 66A-E depict a twenty-eighth flange and bolt mount adapter FBMA-28with characteristic length LC2-28 between 0.55 and 0.7, more preferablybetween 0.6 and 0.65, still more preferably between 0.61 and 0.63 of thetotal length L2-28, used in combination with small UMFDs. The firstsection width w1-28 may have a diameter d1-28, the second section widthw2-28 may have an increasing diameter, the third section width w3-28 mayhave a diameter d3-28, and the fourth section width w4-28 may have adiameter d4-28, with a maximum diameter to characteristic length ratiobetween 2.5 and 4, more preferably between 3 and 3.5, and still morepreferably between 3.15 and 3.25. The transition between third andfourth sections may be a groove with slope towards the fourth section.The first section may have a first bore B1-28 with an external chamfer,a depth and an inner diameter db1-28. A series of four slots S1-28 maybe present with circular portion C1-28 located at an inner diameterds1-28, with a width W1-28, evenly spaced with an angle between eachslot centerline. To each slot S1-28 may correspond a notch N1-28 presentin the third section, with a radius Rn1-28. Two opposing faces OpA-28 ofthe third section located between slots S1-28 may be flattened. Thefourth section may be threaded with a male thread. The optional centerdrill hole CDH2-28 may have a maximum diameter to a maximum depth with aconical countersink.

A pilot adapter may be used to help align the mount adapter to a post orother mounting position on the engine. Pilot adapters may be used incombination with the flange and bolt type mount adapters. Referring toFIG. 6A-6B, a pilot adapter PA may have an overall annular shape withinner diameter g, outer diameter e, and outer lip diameter f such thatg<e<f. The width of the annulus may be h, with thickness e-g. The lipmay display an incline, at an angle i from the horizontal annulussurface. There may be sixteen models of pilot adapters with varyingthicknesses and cross-sections. In an exemplary embodiment of thepresent invention, pilot adapters allow a mount adapter with a largeouter diameter to assemble onto an engine mount with a smaller diameter.In an alternative embodiment pilot adapters allow a mount adapter with asmall outer diameter to assemble onto an engine mount with a largerouter diameter. All pilot adapters may be made of 1018 steel. For eachexemplary embodiment, reference characters may be further distinguishedby a numeric suffix, i.e., g-1 for diameter gin a first embodiment of apilot adapter.

FIGS. 67A-B depict a first pilot adapter PA-1. The total width h-1 ofthis pilot adapter PA-1 may be between 0.025 and 0.125, more preferablybetween 0.05 and 0.12, still more preferably between 0.07 and 0.1 ofdiameter e-1, with a maximum diameter to maximum width ratio between 8and 13, more preferably between 9 and 12, and still more preferablybetween 10 and 11. This adapter may provide a transition from the largerdiameter e-1 to a smaller diameter g-1, and may comprise a lip, and anouter diameter f-1, positioned at an angle i-1. There may be a chamferon the lip side of the inner rim. The transition between the lip and theouter rim of the adapter may have a maximum radius.

FIGS. 68A-B depict a second pilot adapter PA-2. The total width h-2 ofthis pilot adapter PA-2 may be between 0.1 and 0.35, more preferablybetween 0.15 and 0.3, still more preferably between 0.18 and 0.28 ofdiameter e-2, with a maximum diameter to maximum width ratio between 2.5and 5.5, more preferably between 3 and 5, and still more preferablybetween 4 and 4.5. This adapter may provide a transition from the largerdiameter e-2 to a smaller diameter g-2, and may comprise a lip, and anouter diameter f-2, positioned at an angle i-2. There may be a chamferon the lip side of the inner rim. The transition between the lip and theouter rim of the adapter may have a maximum radius.

FIGS. 69A-B depict a third pilot adapter PA-3. The total width h-3 ofthis pilot adapter PA-3 may be between 0.025 and 0.125, more preferablybetween 0.05 and 0.12, still more preferably between 0.07 and 0.11 ofdiameter f-3 positioned at an angle i-3, with a maximum diameter tomaximum width ratio between 8 and 13, more preferably between 9 and 12,and still more preferably between 10 and 11. This adapter may provide atransition from the larger diameter e-3 to a smaller diameter g-3, andmay comprise a lip with an outer diameter f-3, positioned at an anglei-3. There may be a chamfer on the lip side of the inner rim. Thetransition between the lip and the outer rim of the adapter may have amaximum radius.

FIGS. 70A-B depict a fourth pilot adapter PA-4. The total width h-4 ofthis pilot adapter PA-4 may be between 0.2 and 0.4, more preferablybetween 0.25 and 0.38, still more preferably between 0.27 and 0.36 ofdiameter e-4, with a maximum diameter to maximum width ratio between 2.5and 4, more preferably between 3 and 3.5, and still more preferablybetween 3.2 and 3.3. This adapter may provide a transition from thelarger diameter e-4 to a smaller diameter g-4. There may be fourchamfers located on either side of the inner rim and either side of theouter rim.

FIGS. 71A-B depict a fifth pilot adapter PA-5. The total width h-5 ofthis pilot adapter PA-5 may be between 0.35 and 0.6, more preferablybetween 0.4 and 0.57, still more preferably between 0.44 and 0.53 ofdiameter e-5, with a maximum diameter to maximum width ratio between1.75 and 2.5, more preferably between 1.9 and 2.3, and still morepreferably between 2 and 2.2. This adapter may provide a transition fromthe larger diameter e-5 to a smaller diameter g-5. There may be twochamfers located on either side of the outer rim and two chamferslocated on either side of the inner rim.

FIGS. 72A-B depict a sixth pilot adapter PA-6. The total width h-6 ofthis pilot adapter PA-6 may be between 0.35 and 0.6, more preferablybetween 0.4 and 0.55, still more preferably between 0.44 and 0.53 ofdiameter e-6, with a maximum diameter to maximum width ratio between1.75 and 2.5, more preferably between 1.9 and 2.3, and still morepreferably between 2 and 2.2. This adapter may provide a transition froma larger diameter e-6 to a smaller diameter g-6. There may be twochamfers located on either side of the outer rim and two chamferslocated on either side of the inner rim.

FIGS. 73A-B depict a seventh pilot adapter PA-7. The total width h-7 ofthis pilot adapter PA-7 may be between 0.15 and 0.35, more preferablybetween 0.2 and 0.3, still more preferably between 0.23 and 0.28 ofdiameter f-7, with a maximum diameter to maximum width ratio between 3and 4.5, more preferably between 3.7 and 4, and still more preferablybetween 3.8 and 3.9. This adapter with an inner diameter g-7 may providea transition from a larger male diameter f-7, to a diameter e-7. Theadapter may comprise a lip with inner diameter e-7 and outer diameterf-7 positioned at an angle i-7. There may be a chamfer located on theside of the outer rim.

FIGS. 74A-B depict an eighth pilot adapter PA-8. The total width h-8 ofthis pilot adapter PA-8 may be between 0.05 and 0.25, more preferablybetween 0.08 and 0.2, still more preferably between 0.11 and 0.16 ofdiameter f-8, with a maximum diameter to maximum width ratio between 6and 9, more preferably between 6.5 and 8.5, and still more preferablybetween 7 and 8. A portion of width h-8 may have an inner diameter g-8,and the remaining portion of the adapter width may have the innerdiameter e-8. This adapter may provide a transition from a largerdiameter f-8 to a smaller diameter e-8. There may be two chamferslocated on either side of the outer rim.

FIGS. 75A-B depict a ninth pilot adapter PA-9. The total width h-9 ofthis pilot adapter PA-9 may be between 0.03 and 0.18, more preferablybetween 0.05 and 0.15, still more preferably between 0.08 and 0.13 ofdiameter f-9, with a maximum diameter to maximum width ratio between 7.5and 10.5, more preferably between 8 and 10, and still more preferablybetween 8.5 and 9.5. This adapter may provide a transition from a largerdiameter e-9 to a smaller diameter g-9, and may comprise a lip with anouter diameter f-9, positioned at an angle i-9. There may be a chamferon the lip side of the inner rim. The transition between the lip and theouter rim of the adapter may have a maximum radius.

FIGS. 76A-B depict a tenth pilot adapter PA-10. The total width h-10 ofthis pilot adapter PA-10 may be between 0.15 and 0.35, more preferablybetween 0.2 and 0.3, still more preferably between 0.23 and 0.27 ofdiameter e-10, with a maximum diameter to maximum width ratio between 2and 5, more preferably between 3 and 4.5, and still more preferablybetween 3.5 and 4. This adapter may provide a transition from a largerdiameter e-10 to a smaller diameter g-10. There may be four chamferslocated on either side of the outer rim and on either side of the innerrim.

FIGS. 77A-B depict an eleventh pilot adapter PA-11. The total width h-11of this pilot adapter PA-11 may be between 0.2 and 0.4, more preferablybetween 0.25 and 0.35, still more preferably between 0.3 and 0.4 ofdiameter e-11, with a maximum diameter to maximum width ratio between 2and 4, more preferably between 2.5 and 3.5, and still more preferablybetween 2.75 and 3. This adapter may provide a transition from adiameter e-11 to a diameter g-11. There may be two chamfers located oneither side of the outer rim.

FIGS. 78A-B depict a twelfth pilot adapter PA-12. The total width h-12of this pilot adapter PA-12 may be between 0.4 and 0.7, more preferablybetween 0.45 and 0.65, still more preferably between 0.5 and 0.6 ofdiameter e-12, with a maximum diameter to maximum width ratio between 1and 2.5, more preferably between 1.6 and 2.1, and still more preferablybetween 1.8 and 1.9. This adapter may provide a transition from a largerdiameter e-12 to a smaller diameter g-12. There may be four chamferslocated on either side of the outer rim and on either side of the innerrim.

FIGS. 79A-B depict a thirteenth pilot adapter PA-13. The total widthh-13 of this pilot adapter PA-13 may be between 0.03 and 0.23, morepreferably between 0.05 and 0.2, still more preferably between 0.1 and0.15 of diameter e-13, with a maximum diameter to maximum width ratiobetween 6 and 9, more preferably between 7 and 8.5, and still morepreferably between 7.8 and 7.9. This adapter may provide a transitionfrom a larger diameter e-13 to a smaller diameter g-13. There may befour chamfers located on either side of the outer rim and on either sideof the inner rim.

FIGS. 80A-B depict a fourteenth pilot adapter PA-14. The total widthh-14 of this pilot adapter PA-14 may be between 0.2 and 0.35, morepreferably between 0.23 and 0.31, still more preferably between 0.25 and0.29 of diameter f-14, with a maximum diameter to maximum width ratiobetween 2.5 and 4.5, more preferably between 3 and 4, and still morepreferably between 3.6 and 3.7. This adapter with an inner diameter g-14may provide a transition from a larger male diameter f-14, to a diametere-14. The adapter may comprise a lip with inner diameter e-14 and outerdiameter f-14 positioned at an angle i-14. There may be a chamferlocated on the side of the outer rim.

FIGS. 81A-B depict a fifteenth pilot adapter PA-15. The total width h-15of this pilot adapter PA-15 may be between 0.03 and 0.18, morepreferably between 0.05 and 0.15, still more preferably between 0.08 and0.13 of diameter f-1, with a maximum diameter to maximum width ratiobetween 7 and 11, more preferably between 7.5 and 10.5, and still morepreferably between 8 and 10. This adapter may provide a transition froma larger diameter e-15 to a smaller diameter g-15, and may comprise alip with an outer diameter f-15, positioned at an angle i-15. There maybe a chamfer on the lip side of the inner rim. The transition betweenthe lip and the outer rim of the adapter may have a maximum radius.

FIGS. 82A-B depict a sixteenth pilot adapter PA-16. The total width h-16of this pilot adapter PA-16 may be between 0.15 and 0.29, morepreferably between 0.18 and 0.26, still more preferably between 0.20 and0.24 of diameter f-16, with a maximum diameter to maximum width ratiobetween 3 and 6, more preferably between 3.5 and 5.5, and still morepreferably between 4 and 5. This adapter with an inner diameter g-16 mayprovide a transition from a larger male diameter f-16 to a diametere-16. The adapter may comprise a lip with inner diameter e-16 and outerdiameter f-16 positioned at an angle i-16. There may be a chamferlocated on the side outer rim.

In an exemplary embodiment of the present invention, thread gauges maybe used for thread inspection of threaded portions present on the threadtype mount adapters. Referring to FIGS. 7A-7B, a thread gauge TG mayhave an overall cylindrical shape, with total length L3. The threadgauge can be divided into three sections, the first section may havewidth j and diameter Dj, the second section may have width k anddiameter Dk, the third section may have width l and diameter Dl. Boththe first and third section may be threaded, with thread designationengraved on each end. All thread gauges may be made of 4140 steel,quenched and tempered. And all thread gauges may be treated with a saltbath of nitride melonite QPQ, which may provide a uniform coating andenhances resistance to corrosion. For each exemplary embodiment,reference characters may be further distinguished by a numeric suffix,i.e., Dk-1 for diameter Dk in a first embodiment of a thread gauge.

Referring to FIGS. 83A-B, the first thread gauge TG-1 may have a lengthL3-1 between 1.5″ and 2.0″, with a width j-1 and a diameter Dj-1, thesecond section may have a width k-1 and a diameter Dk-1, the thirdsection may have a width l-1 and a diameter Dl-1. The first section mayhave at least eight threads. The third section may have at least eightthreads. Each end may have a chamfer.

Referring to FIGS. 84A-B, the second thread gauge TG-2 may have a lengthL3-2 between 1″ and 2.5″, more preferably between 1.5″ and 2″, stillmore preferably between 1.7 and 1.8″, with a width j-2 and a diameterDj-2, the second section may have a width k-2 and a diameter Dk-2, thethird section may have a width l-2 and a diameter Dl-2. The firstsection may have at least six threads. The third section may have atleast six threads. Each end may have a chamfer.

Referring to FIGS. 85A-C, the third thread gauge TG-3 may have a lengthL3-3 between 1.5″ and 3″, more preferably between 1.75″ and 2.75″, stillmore preferably between 2 and 2.5″, with a width j-3 and a diameterDj-3, the second section may have a width k-3 and a diameter Dk-3, thethird section may have a width l-3 and a diameter Dl-3. The firstsection may have at least eight threads. The third section may be boredout, and the bore hole may be threaded. Each end may have a chamfer.

Referring to FIGS. 87A-C and 91A-C, the holding cradle HC may comprise awrenching plate WP and a tool cradle TC, which may be a rectangularframe with five sides welded to each other using fillet welds across thethroat. Four sides of the tool cradle TC may be flat panels, one sideconsists of a flat plate FP with a lip on three sides. The wrenchingplate WP may comprise four drill holes HC-H1 spaced apart, and may belocated opposite a plate machined with a semi-circular opening HC-CO.Referring to the drill template shown in FIGS. 88A-D, the plate FP ofthe tool cradle TC may display four holes HC-H2, spaced between 8″ to 9″apart to anchor down the holding cradle HC to the tool cart. Thewrenching plate WP shown in FIG. 89 may be bolted onto the five-sidedtool cradle TC on the inside, using the four pre-drilled holes HC-PD inthe tool cradle TC spaced apart, using four hex bolts HC-B, four hexnuts HC-N, and eight associated washers HC-W. The wrenching plate WP mayoffer a rectangular slot HC-S. Finally, a stiffener plate shown in FIG.90A-90B may comprise four drill holes HC-SH matching those HC-H2 and maybe added to the bottom of the assembly between the holding cradle bottomplate FP and the tool cart.

The holding cradle HC may be placed on the tool cart. The UMFD can bepositioned in the holding cradle in a stable fashion, such that themaximum diameter of the UMFD may make contact with the bottom of theholding cradle, and the receiving nut 11 of the UMFD may protrude fromthe holding cradle through the wrenching plate, providing access tomount on the required adapters.

Referring to FIG. 8, in one exemplary embodiment a cart for storingeasily accessible elements includes a rectangular structure comprisingshelves and set on casters. All clutch heads, interchangeable brackets,drive adapters, and fan pilot adapters may be stored in a single toolcart, as shown in FIG. 8. This cart may be placed on casters Cs formaneuvering, and may comprise a tool table with a flat work surface TT,at one extremity of which a holding cradle HC may be fixed, within whicha clutch head may be positioned to take apart or assemble the componentswithin reach. The holding cradle HC may be fixed using the four boltholes from the bottom plate, and may use the stiffener plate shown inFIG. 90A-90B as additional reinforcement. The flat surface which is thetop of the lower half of the tool cart may display instructions andreference guides. In addition, the cart may comprise a backboard BBwhich roughly doubles the height of the rectangular structure, and onwhich an array of open trays S2 may be installed to hold adapter piecesrequired to replace the viscous clutch at hand. Each of the open traysS2 may store one type of mounting adapter or different types of mountingadapters. Below the flat surface TT, a plurality of shelves S1 may bearranged to hold larger parts such as UMFDs or fans.

Referring to FIGS. 86A-C, a fully circular spanner wrench SW may beset-up with two opposed alloy steel dowel pins DWP which protrude fromthe spanner wrench surface. A table which may be provided may helpdetermine the required wrench type based on the mount adapter used. Withthe holding cradle HC, the clutch assembly can be immobilized, and anappropriate wrench, such as the spanner wrench, used to torque therequired adapters onto the UMFD unit.

Because many possible embodiments may be made of the invention withoutdeparting from the scope thereof, it is to be understood that all matterherein set forth or shown in the accompanying drawings is to beinterpreted as illustrative and not in a limiting sense.

1. (canceled)
 2. A modular fan clutch assembly for replacing a first fanclutch of a plurality of differently configured fan clutches, each fanclutch being configured for mounting to a respective mounting positionof a respective vehicular engine block mount, the modular fan clutchassembly comprising: a plurality of modular components eachinterchangeably selected based on one or more of a plurality ofdimensions of the first fan clutch, the plurality of modular componentscomprising a universal modular fan drive selected from a plurality ofdifferently configured universal modular fan drives based at least inpart on at least one of the plurality of dimensions of the first fanclutch, and a mount adapter selected from a plurality of differentlyconfigured mount adapters for connecting the selected universal modularfan drive to the respective vehicular engine block mount, wherein themount adapted is selected based at least in part on at least another ofthe plurality of dimensions of the first fan clutch, and a first end ofthe selected mount adapter attaches to a first end of the selecteduniversal modular fan drive such that the first end of the selectedmount adapter is complementarily received by a receiving port on thefirst end of the selected universal modular fan drive; wherein themodular fan clutch assembly has a configuration that is different from aconfiguration of the first fan clutch; and wherein the configuration ofthe modular fan clutch assembly is one of a plurality of configurationsof fan clutch assemblies capable of being assembled using the pluralityof modular components.
 3. The modular fan clutch assembly of claim 2,wherein the plurality of dimensions of the first fan clutch include afan bolt circle diameter, a fan pilot diameter, and a characteristiclength defined between a viscous clutch fan-side surface and a drivepilot surface.
 4. The modular fan clutch assembly of claim 2, whereinthe plurality of modular components further comprises a fan adapter foradapting a pilot and bolt pattern of the selected universal modular fandrive to a fan blade hub.
 5. The modular fan clutch assembly of claim 4,wherein the fan adapter is positioned at the first end of the selecteduniversal modular fan drive.
 6. The modular fan clutch assembly of claim2, wherein the selected mount adapter is configured to complementarilyattach to a bracket on the respective vehicular engine block mount. 7.The modular fan clutch assembly of claim 6, wherein, when the bracket isa bolt-on type bracket, the selected mount adapter is a flange and boltmount adapter.
 8. The modular fan clutch assembly of claim 7, whereinthe selected mount adapter comprises a substantially circular bodyextending radially from a center point on the selected mount adapter. 9.The modular fan clutch assembly of claim 8, wherein the selected mountadapter comprises a plurality of cutouts evenly spaced about acircumference of the substantially circular body.
 10. The modular fanclutch assembly of claim 7, wherein the selected mount adapter comprisesa plurality of longitudinally-arranged sections each affixed to anadjacent section of the plurality of longitudinally-arranged sections,wherein each of the plurality of longitudinally-arranged sections issubstantially circular in shape, and each of the plurality oflongitudinally-arranged sections has a predetermined width.
 11. Themodular fan clutch assembly of claim 10, wherein one or more of thelongitudinally-arranged sections of the selected mount adapter comprisea respective set of a plurality of cutouts evenly spaced about acircumference of the respective longitudinally-arranged section.
 12. Amethod for assembling a modular fan clutch assembly, the methodcomprising: measuring, on a first fan clutch removed from a mountingposition of a vehicular engine block mount, a plurality of first fanclutch dimensions; selecting, based on one or more of the plurality offirst fan clutch dimensions, a universal modular fan drive from aplurality of differently configured universal modular fan drives;selecting, based on one or more of the plurality of first fan clutchdimensions, a mount adapter from a plurality of differently configuredmount adapters for connecting the selected universal modular fan driveto the vehicular engine block mount; attaching a first end of theselected mount adapter to the selected universal modular fan drive suchthat the first end of the selected mount adapter is complementarilyreceived by a receiving port on the selected universal modular fandrive; and replacing the first fan clutch with the assembled fan clutchassembly at the mounting position of the vehicular engine block mount.13. The method of claim 12, wherein a configuration of the first fanclutch is one of a plurality of configurations of fan clutchesreplaceable using the plurality of differently configured universalmodular fan drives and the plurality of differently configured mountadapters.
 14. The method of claim 13, wherein the plurality of first fanclutch dimensions for the first fan clutch are different from aplurality of second fan clutch dimensions for other fan clutchconfigurations of the plurality of configurations of fan clutches. 15.The method of claim 12, wherein the modular fan clutch assembly has aconfiguration that is different from the configuration of the first fanclutch.
 16. The method of claim 12, wherein the plurality of first fanclutch dimensions include a fan bolt circle diameter, a fan pilotdiameter, and a characteristic length defined between a viscous clutchfan-side surface and a drive pilot surface.
 17. The method of claim 12,wherein the selected mount adapter is configured to complementarilyattach to a bracket on the respective vehicular engine block mount. 18.The method of claim 17, wherein, when the bracket is a bolt-on typebracket, the selected mount adapter is a flange and bolt mount adapter.19. The method of claim 18, wherein the selected mount adapter comprisesa plurality of longitudinally-arranged sections each affixed to anadjacent section of the plurality of longitudinally-arranged sections,wherein each of the plurality of longitudinally-arranged sections issubstantially circular in shape, and each of the plurality oflongitudinally-arranged sections has a predetermined width.
 20. Themethod of claim 19, wherein one or more of the longitudinally-arrangedsections of the selected mount adapter comprise a respective set of aplurality of cutouts evenly spaced about a circumference of therespective longitudinally-arranged section.